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-2(-a+1)=7(-a+1)
We simplify the equation to the form, which is simple to understand
-2(-a+1)=7(-a+1)
Reorder the terms in parentheses
+(+2a-2)=7*(-a+1)
Remove unnecessary parentheses
+2a-2=+7+*(-a+1+)
Reorder the terms in parentheses
+2a-2=+(-7a+7)
Remove unnecessary parentheses
+2a-2=-7a+7
We move all terms containing a to the left and all other terms to the right.
+2a+7a=+7+2
We simplify left and right side of the equation.
+9a=+9
We divide both sides of the equation by 9 to get a.
a=1
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