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4(2a+3)-9a=-3(a-1)+31
We simplify the equation to the form, which is simple to understand
4(2a+3)-9a=-3(a-1)+31
Reorder the terms in parentheses
+(+8a+12)-9a=-3*(a-1)+31
Remove unnecessary parentheses
+8a+12-9a=-3+*(+a-1+)+31
Reorder the terms in parentheses
+8a+12-9a=+(-3a+3)+31
Remove unnecessary parentheses
+8a+12-9a=-3a+3+31
We move all terms containing a to the left and all other terms to the right.
+8a-9a+3a=+3+31-12
We simplify left and right side of the equation.
+2a=+22
We divide both sides of the equation by 2 to get a.
a=11
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