42-[4+6y-3(y+5)]=-(4y-5)-[9(y-1)-21y+16]

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Solution for 42-[4+6y-3(y+5)]=-(4y-5)-[9(y-1)-21y+16] equation:


Simplifying
42 + -1[4 + 6y + -3(y + 5)] = -1(4y + -5) + -1[9(y + -1) + -21y + 16]

Reorder the terms:
42 + -1[4 + 6y + -3(5 + y)] = -1(4y + -5) + -1[9(y + -1) + -21y + 16]
42 + -1[4 + 6y + (5 * -3 + y * -3)] = -1(4y + -5) + -1[9(y + -1) + -21y + 16]
42 + -1[4 + 6y + (-15 + -3y)] = -1(4y + -5) + -1[9(y + -1) + -21y + 16]

Reorder the terms:
42 + -1[4 + -15 + 6y + -3y] = -1(4y + -5) + -1[9(y + -1) + -21y + 16]

Combine like terms: 4 + -15 = -11
42 + -1[-11 + 6y + -3y] = -1(4y + -5) + -1[9(y + -1) + -21y + 16]

Combine like terms: 6y + -3y = 3y
42 + -1[-11 + 3y] = -1(4y + -5) + -1[9(y + -1) + -21y + 16]
42 + [-11 * -1 + 3y * -1] = -1(4y + -5) + -1[9(y + -1) + -21y + 16]
42 + [11 + -3y] = -1(4y + -5) + -1[9(y + -1) + -21y + 16]

Combine like terms: 42 + 11 = 53
53 + -3y = -1(4y + -5) + -1[9(y + -1) + -21y + 16]

Reorder the terms:
53 + -3y = -1(-5 + 4y) + -1[9(y + -1) + -21y + 16]
53 + -3y = (-5 * -1 + 4y * -1) + -1[9(y + -1) + -21y + 16]
53 + -3y = (5 + -4y) + -1[9(y + -1) + -21y + 16]

Reorder the terms:
53 + -3y = 5 + -4y + -1[9(-1 + y) + -21y + 16]
53 + -3y = 5 + -4y + -1[(-1 * 9 + y * 9) + -21y + 16]
53 + -3y = 5 + -4y + -1[(-9 + 9y) + -21y + 16]

Reorder the terms:
53 + -3y = 5 + -4y + -1[-9 + 16 + 9y + -21y]

Combine like terms: -9 + 16 = 7
53 + -3y = 5 + -4y + -1[7 + 9y + -21y]

Combine like terms: 9y + -21y = -12y
53 + -3y = 5 + -4y + -1[7 + -12y]
53 + -3y = 5 + -4y + [7 * -1 + -12y * -1]
53 + -3y = 5 + -4y + [-7 + 12y]

Reorder the terms:
53 + -3y = 5 + -7 + -4y + 12y

Combine like terms: 5 + -7 = -2
53 + -3y = -2 + -4y + 12y

Combine like terms: -4y + 12y = 8y
53 + -3y = -2 + 8y

Solving
53 + -3y = -2 + 8y

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-8y' to each side of the equation.
53 + -3y + -8y = -2 + 8y + -8y

Combine like terms: -3y + -8y = -11y
53 + -11y = -2 + 8y + -8y

Combine like terms: 8y + -8y = 0
53 + -11y = -2 + 0
53 + -11y = -2

Add '-53' to each side of the equation.
53 + -53 + -11y = -2 + -53

Combine like terms: 53 + -53 = 0
0 + -11y = -2 + -53
-11y = -2 + -53

Combine like terms: -2 + -53 = -55
-11y = -55

Divide each side by '-11'.
y = 5

Simplifying
y = 5

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