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3(a+7)=7+a
We simplify the equation to the form, which is simple to understand
3(a+7)=7+a
Reorder the terms in parentheses
+(+3a+21)=7+a
Remove unnecessary parentheses
+3a+21=+7+a
We move all terms containing a to the left and all other terms to the right.
+3a-1a=+7-21
We simplify left and right side of the equation.
+2a=-14
We divide both sides of the equation by 2 to get a.
a=-7
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