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-90=-5(2-2x)
We simplify the equation to the form, which is simple to understand
-90=-5(2-2x)
Reorder the terms in parentheses
-90=+(-10+10x)
Remove unnecessary parentheses
-90=-10+10x
We move all terms containing x to the left and all other terms to the right.
-10x=-10+90
We simplify left and right side of the equation.
-10x=+80
We divide both sides of the equation by -010 to get x.
x=-8
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