21-[2+9y-4(y+3)]=-4(5y-4)-[9(y-1)-20y+6]

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Solution for 21-[2+9y-4(y+3)]=-4(5y-4)-[9(y-1)-20y+6] equation:


Simplifying
21 + -1[2 + 9y + -4(y + 3)] = -4(5y + -4) + -1[9(y + -1) + -20y + 6]

Reorder the terms:
21 + -1[2 + 9y + -4(3 + y)] = -4(5y + -4) + -1[9(y + -1) + -20y + 6]
21 + -1[2 + 9y + (3 * -4 + y * -4)] = -4(5y + -4) + -1[9(y + -1) + -20y + 6]
21 + -1[2 + 9y + (-12 + -4y)] = -4(5y + -4) + -1[9(y + -1) + -20y + 6]

Reorder the terms:
21 + -1[2 + -12 + 9y + -4y] = -4(5y + -4) + -1[9(y + -1) + -20y + 6]

Combine like terms: 2 + -12 = -10
21 + -1[-10 + 9y + -4y] = -4(5y + -4) + -1[9(y + -1) + -20y + 6]

Combine like terms: 9y + -4y = 5y
21 + -1[-10 + 5y] = -4(5y + -4) + -1[9(y + -1) + -20y + 6]
21 + [-10 * -1 + 5y * -1] = -4(5y + -4) + -1[9(y + -1) + -20y + 6]
21 + [10 + -5y] = -4(5y + -4) + -1[9(y + -1) + -20y + 6]

Combine like terms: 21 + 10 = 31
31 + -5y = -4(5y + -4) + -1[9(y + -1) + -20y + 6]

Reorder the terms:
31 + -5y = -4(-4 + 5y) + -1[9(y + -1) + -20y + 6]
31 + -5y = (-4 * -4 + 5y * -4) + -1[9(y + -1) + -20y + 6]
31 + -5y = (16 + -20y) + -1[9(y + -1) + -20y + 6]

Reorder the terms:
31 + -5y = 16 + -20y + -1[9(-1 + y) + -20y + 6]
31 + -5y = 16 + -20y + -1[(-1 * 9 + y * 9) + -20y + 6]
31 + -5y = 16 + -20y + -1[(-9 + 9y) + -20y + 6]

Reorder the terms:
31 + -5y = 16 + -20y + -1[-9 + 6 + 9y + -20y]

Combine like terms: -9 + 6 = -3
31 + -5y = 16 + -20y + -1[-3 + 9y + -20y]

Combine like terms: 9y + -20y = -11y
31 + -5y = 16 + -20y + -1[-3 + -11y]
31 + -5y = 16 + -20y + [-3 * -1 + -11y * -1]
31 + -5y = 16 + -20y + [3 + 11y]

Reorder the terms:
31 + -5y = 16 + 3 + -20y + 11y

Combine like terms: 16 + 3 = 19
31 + -5y = 19 + -20y + 11y

Combine like terms: -20y + 11y = -9y
31 + -5y = 19 + -9y

Solving
31 + -5y = 19 + -9y

Solving for variable 'y'.

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

Add '9y' to each side of the equation.
31 + -5y + 9y = 19 + -9y + 9y

Combine like terms: -5y + 9y = 4y
31 + 4y = 19 + -9y + 9y

Combine like terms: -9y + 9y = 0
31 + 4y = 19 + 0
31 + 4y = 19

Add '-31' to each side of the equation.
31 + -31 + 4y = 19 + -31

Combine like terms: 31 + -31 = 0
0 + 4y = 19 + -31
4y = 19 + -31

Combine like terms: 19 + -31 = -12
4y = -12

Divide each side by '4'.
y = -3

Simplifying
y = -3

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