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5a=2a-18
We move all terms to the left:
5a-(2a-18)=0
We get rid of parentheses
5a-2a+18=0
We add all the numbers together, and all the variables
3a+18=0
We move all terms containing a to the left, all other terms to the right
3a=-18
a=-18/3
a=-6
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