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3-18a=-18+3a
We move all terms to the left:
3-18a-(-18+3a)=0
We add all the numbers together, and all the variables
-18a-(3a-18)+3=0
We get rid of parentheses
-18a-3a+18+3=0
We add all the numbers together, and all the variables
-21a+21=0
We move all terms containing a to the left, all other terms to the right
-21a=-21
a=-21/-21
a=1
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