3a-3(7+5a)=-18+(-9a)

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Solution for 3a-3(7+5a)=-18+(-9a) equation:


3a-3(7+5a)=-18+(-9a)

We simplify the equation to the form, which is simple to understand 
3a-3(7+5a)=-18+(-9a)

Reorder the terms in parentheses
3a+(-21-15a)=-18+(-9a)

Remove unnecessary parentheses
+3a-21-15a=-18+(-9a+)

Remove unnecessary parentheses
+3a-21-15a=-18-9a

We move all terms containing a to the left and all other terms to the right. 
+3a-15a+9a=-18+21

We simplify left and right side of the equation. 
-3a=+3

We divide both sides of the equation by -3 to get a. 
a=-1

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