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-2x-4(-2x-9)=90
We simplify the equation to the form, which is simple to understand
-2x-4(-2x-9)=90
Reorder the terms in parentheses
-2x+(+8x+36)=90
Remove unnecessary parentheses
-2x+8x+36=+90
We move all terms containing x to the left and all other terms to the right.
-2x+8x=+90-36
We simplify left and right side of the equation.
+6x=+54
We divide both sides of the equation by 6 to get x.
x=9
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