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2(a+7)+4=0
We simplify the equation to the form, which is simple to understand
2(a+7)+4=0
Reorder the terms in parentheses
+(+2a+14)+4=0
Remove unnecessary parentheses
+2a+14+4=0
We move all terms containing a to the left and all other terms to the right.
+2a=0-14-4
We simplify left and right side of the equation.
+2a=-18
We divide both sides of the equation by 2 to get a.
a=-9
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