9y-21=-8(y-8)

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Solution for 9y-21=-8(y-8) equation:


Simplifying
9y + -21 = -8(y + -8)

Reorder the terms:
-21 + 9y = -8(y + -8)

Reorder the terms:
-21 + 9y = -8(-8 + y)
-21 + 9y = (-8 * -8 + y * -8)
-21 + 9y = (64 + -8y)

Solving
-21 + 9y = 64 + -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.
-21 + 9y + 8y = 64 + -8y + 8y

Combine like terms: 9y + 8y = 17y
-21 + 17y = 64 + -8y + 8y

Combine like terms: -8y + 8y = 0
-21 + 17y = 64 + 0
-21 + 17y = 64

Add '21' to each side of the equation.
-21 + 21 + 17y = 64 + 21

Combine like terms: -21 + 21 = 0
0 + 17y = 64 + 21
17y = 64 + 21

Combine like terms: 64 + 21 = 85
17y = 85

Divide each side by '17'.
y = 5

Simplifying
y = 5

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