12-3y=-9

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Solution for 12-3y=-9 equation: 


Simplifying
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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