-2y-12=9y+21

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Solution for -2y-12=9y+21 equation:


Simplifying
-2y + -12 = 9y + 21

Reorder the terms:
-12 + -2y = 9y + 21

Reorder the terms:
-12 + -2y = 21 + 9y

Solving
-12 + -2y = 21 + 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.
-12 + -2y + -9y = 21 + 9y + -9y

Combine like terms: -2y + -9y = -11y
-12 + -11y = 21 + 9y + -9y

Combine like terms: 9y + -9y = 0
-12 + -11y = 21 + 0
-12 + -11y = 21

Add '12' to each side of the equation.
-12 + 12 + -11y = 21 + 12

Combine like terms: -12 + 12 = 0
0 + -11y = 21 + 12
-11y = 21 + 12

Combine like terms: 21 + 12 = 33
-11y = 33

Divide each side by '-11'.
y = -3

Simplifying
y = -3

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