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-12-15=-3(3+4x)
We simplify the equation to the form, which is simple to understand
-12-15=-3(3+4x)
Reorder the terms in parentheses
-12-15=+(-9-12x)
Remove unnecessary parentheses
-12-15=-9-12x
We move all terms containing x to the left and all other terms to the right.
+12x=-9+12+15
We simplify left and right side of the equation.
+12x=+18
We divide both sides of the equation by 012 to get x.
x=1.5
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