-2y-9=8y+21

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Solution for -2y-9=8y+21 equation:


Simplifying
-2y + -9 = 8y + 21

Reorder the terms:
-9 + -2y = 8y + 21

Reorder the terms:
-9 + -2y = 21 + 8y

Solving
-9 + -2y = 21 + 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.
-9 + -2y + -8y = 21 + 8y + -8y

Combine like terms: -2y + -8y = -10y
-9 + -10y = 21 + 8y + -8y

Combine like terms: 8y + -8y = 0
-9 + -10y = 21 + 0
-9 + -10y = 21

Add '9' to each side of the equation.
-9 + 9 + -10y = 21 + 9

Combine like terms: -9 + 9 = 0
0 + -10y = 21 + 9
-10y = 21 + 9

Combine like terms: 21 + 9 = 30
-10y = 30

Divide each side by '-10'.
y = -3

Simplifying
y = -3

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