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16a=9a-18
We move all terms to the left:
16a-(9a-18)=0
We get rid of parentheses
16a-9a+18=0
We add all the numbers together, and all the variables
7a+18=0
We move all terms containing a to the left, all other terms to the right
7a=-18
a=-18/7
a=-2+4/7
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