-3y-12=9

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Solution for -3y-12=9 equation: 


Simplifying
-3y + -12 = 9

Reorder the terms:
-12 + -3y = 9

Solving
-12 + -3y = 9

Solving for variable 'y'.

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

Add '12' to each side of the equation.
-12 + 12 + -3y = 9 + 12

Combine like terms: -12 + 12 = 0
0 + -3y = 9 + 12
-3y = 9 + 12

Combine like terms: 9 + 12 = 21
-3y = 21

Divide each side by '-3'.
y = -7

Simplifying
y = -7

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