7=5y+4(-y+9)-7(7+3y)

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Solution for 7=5y+4(-y+9)-7(7+3y) equation:


Simplifying
7 = 5y + 4(-1y + 9) + -7(7 + 3y)

Reorder the terms:
7 = 5y + 4(9 + -1y) + -7(7 + 3y)
7 = 5y + (9 * 4 + -1y * 4) + -7(7 + 3y)
7 = 5y + (36 + -4y) + -7(7 + 3y)
7 = 5y + 36 + -4y + (7 * -7 + 3y * -7)
7 = 5y + 36 + -4y + (-49 + -21y)

Reorder the terms:
7 = 36 + -49 + 5y + -4y + -21y

Combine like terms: 36 + -49 = -13
7 = -13 + 5y + -4y + -21y

Combine like terms: 5y + -4y = 1y
7 = -13 + 1y + -21y

Combine like terms: 1y + -21y = -20y
7 = -13 + -20y

Solving
7 = -13 + -20y

Solving for variable 'y'.

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

Add '20y' to each side of the equation.
7 + 20y = -13 + -20y + 20y

Combine like terms: -20y + 20y = 0
7 + 20y = -13 + 0
7 + 20y = -13

Add '-7' to each side of the equation.
7 + -7 + 20y = -13 + -7

Combine like terms: 7 + -7 = 0
0 + 20y = -13 + -7
20y = -13 + -7

Combine like terms: -13 + -7 = -20
20y = -20

Divide each side by '20'.
y = -1

Simplifying
y = -1

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