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7(4a+8)+7(a+11)=28
We simplify the equation to the form, which is simple to understand
7(4a+8)+7(a+11)=28
Reorder the terms in parentheses
+(+28a+56)+7*(a+11)=28
Remove unnecessary parentheses
+28a+56+7+*(+a+11+)=+28
Reorder the terms in parentheses
+28a+56+(+7a+77)=28
Remove unnecessary parentheses
+28a+56+7a+77=+28
We move all terms containing a to the left and all other terms to the right.
+28a+7a=+28-56-77
We simplify left and right side of the equation.
+35a=-105
We divide both sides of the equation by 35 to get a.
a=-3
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