12=12y-9y

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Solution for 12=12y-9y equation:


Simplifying
12 = 12y + -9y

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

Solving
12 = 3y

Solving for variable 'y'.

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

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

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

Add '-12' to each side of the equation.
12 + -12 + -3y = 0 + -12

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

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

Divide each side by '-3'.
y = 4

Simplifying
y = 4

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