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-89=-1+2(5-7x)
We simplify the equation to the form, which is simple to understand
-89=-1+2(5-7x)
Reorder the terms in parentheses
-89=-1+(+10-14x)
Remove unnecessary parentheses
-89=-1+10-14x
We move all terms containing x to the left and all other terms to the right.
+14x=-1+10+89
We simplify left and right side of the equation.
+14x=+98
We divide both sides of the equation by 014 to get x.
x=7
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