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5+7(a+4)=15
We simplify the equation to the form, which is simple to understand
5+7(a+4)=15
Reorder the terms in parentheses
5+(+7a+28)=15
Remove unnecessary parentheses
+5+7a+28=+15
We move all terms containing a to the left and all other terms to the right.
+7a=+15-5-28
We simplify left and right side of the equation.
+7a=-18
We divide both sides of the equation by 7 to get a.
a=-2.57142857143
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