-3*4+9y=-57

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Solution for -3*4+9y=-57 equation: 


Simplifying
-3 * 4 + 9y = -57

Multiply -3 * 4
-12 + 9y = -57

Solving
-12 + 9y = -57

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 + 9y = -57 + 12

Combine like terms: -12 + 12 = 0
0 + 9y = -57 + 12
9y = -57 + 12

Combine like terms: -57 + 12 = -45
9y = -45

Divide each side by '9'.
y = -5

Simplifying
y = -5

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