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54=5a-18
We move all terms to the left:
54-(5a-18)=0
We get rid of parentheses
-5a+18+54=0
We add all the numbers together, and all the variables
-5a+72=0
We move all terms containing a to the left, all other terms to the right
-5a=-72
a=-72/-5
a=14+2/5
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