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5a=3a+18
We move all terms to the left:
5a-(3a+18)=0
We get rid of parentheses
5a-3a-18=0
We add all the numbers together, and all the variables
2a-18=0
We move all terms containing a to the left, all other terms to the right
2a=18
a=18/2
a=9
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