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-a+5(-2a+3)=-18
We move all terms to the left:
-a+5(-2a+3)-(-18)=0
We add all the numbers together, and all the variables
-1a+5(-2a+3)+18=0
We multiply parentheses
-1a-10a+15+18=0
We add all the numbers together, and all the variables
-11a+33=0
We move all terms containing a to the left, all other terms to the right
-11a=-33
a=-33/-11
a=+3
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