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-2x-2(-7x-9)=138
We simplify the equation to the form, which is simple to understand
-2x-2(-7x-9)=138
Reorder the terms in parentheses
-2x+(+14x+18)=138
Remove unnecessary parentheses
-2x+14x+18=+138
We move all terms containing x to the left and all other terms to the right.
-2x+14x=+138-18
We simplify left and right side of the equation.
+12x=+120
We divide both sides of the equation by 12 to get x.
x=10
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