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-99=-7x+2(-4x-12)
We simplify the equation to the form, which is simple to understand
-99=-7x+2(-4x-12)
Reorder the terms in parentheses
-99=-7x+(-8x-24)
Remove unnecessary parentheses
-99=-7x-8x-24
We move all terms containing x to the left and all other terms to the right.
+7x+8x=-24+99
We simplify left and right side of the equation.
+15x=+75
We divide both sides of the equation by 15 to get x.
x=5
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