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

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


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

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

Reorder the terms:
-21 + 8y = -9(8 + y)
-21 + 8y = (8 * -9 + y * -9)
-21 + 8y = (-72 + -9y)

Solving
-21 + 8y = -72 + -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.
-21 + 8y + 9y = -72 + -9y + 9y

Combine like terms: 8y + 9y = 17y
-21 + 17y = -72 + -9y + 9y

Combine like terms: -9y + 9y = 0
-21 + 17y = -72 + 0
-21 + 17y = -72

Add '21' to each side of the equation.
-21 + 21 + 17y = -72 + 21

Combine like terms: -21 + 21 = 0
0 + 17y = -72 + 21
17y = -72 + 21

Combine like terms: -72 + 21 = -51
17y = -51

Divide each side by '17'.
y = -3

Simplifying
y = -3

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