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-3(6-7a)=9(a+10)
We simplify the equation to the form, which is simple to understand
-3(6-7a)=9(a+10)
Reorder the terms in parentheses
+(-18+21a)=9*(a+10)
Remove unnecessary parentheses
-18+21a=+9+*(+a+10+)
Reorder the terms in parentheses
-18+21a=+(+9a+90)
Remove unnecessary parentheses
-18+21a=+9a+90
We move all terms containing a to the left and all other terms to the right.
+21a-9a=+90+18
We simplify left and right side of the equation.
+12a=+108
We divide both sides of the equation by 12 to get a.
a=9
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