3(5-y)=-12

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Solution for 3(5-y)=-12 equation: 


Simplifying
3(5 + -1y) = -12
(5 * 3 + -1y * 3) = -12
(15 + -3y) = -12

Solving
15 + -3y = -12

Solving for variable 'y'.

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

Add '-15' to each side of the equation.
15 + -15 + -3y = -12 + -15

Combine like terms: 15 + -15 = 0
0 + -3y = -12 + -15
-3y = -12 + -15

Combine like terms: -12 + -15 = -27
-3y = -27

Divide each side by '-3'.
y = 9

Simplifying
y = 9

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