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3(-4+3a)=-57
We simplify the equation to the form, which is simple to understand
3(-4+3a)=-57
Reorder the terms in parentheses
+(-12+9a)=-57
Remove unnecessary parentheses
-12+9a=-57
We move all terms containing a to the left and all other terms to the right.
+9a=-57+12
We simplify left and right side of the equation.
+9a=-45
We divide both sides of the equation by 9 to get a.
a=-5
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