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7(4+2a)=84
We simplify the equation to the form, which is simple to understand
7(4+2a)=84
Reorder the terms in parentheses
+(+28+14a)=84
Remove unnecessary parentheses
+28+14a=+84
We move all terms containing a to the left and all other terms to the right.
+14a=+84-28
We simplify left and right side of the equation.
+14a=+56
We divide both sides of the equation by 14 to get a.
a=4
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