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-144=3x-3(-4x+3)
We simplify the equation to the form, which is simple to understand
-144=3x-3(-4x+3)
Reorder the terms in parentheses
-144=3x+(+12x-9)
Remove unnecessary parentheses
-144=+3x+12x-9
We move all terms containing x to the left and all other terms to the right.
-3x-12x=-9+144
We simplify left and right side of the equation.
-15x=+135
We divide both sides of the equation by -15 to get x.
x=-9
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