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9a=10a+18
We move all terms to the left:
9a-(10a+18)=0
We get rid of parentheses
9a-10a-18=0
We add all the numbers together, and all the variables
-1a-18=0
We move all terms containing a to the left, all other terms to the right
-a=18
a=18/-1
a=-18
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