3y-4y=12

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Solution for 3y-4y=12 equation: 


Simplifying
3y + -4y = 12

Combine like terms: 3y + -4y = -1y
-1y = 12

Solving
-1y = 12

Solving for variable 'y'.

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

Divide each side by '-1'.
y = -12

Simplifying
y = -12

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