12=3y-9

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Solution for 12=3y-9 equation:


Simplifying
12 = 3y + -9

Reorder the terms:
12 = -9 + 3y

Solving
12 = -9 + 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 = -9 + 3y + -3y

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

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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