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12a-7-9a-18=a+35
We move all terms to the left:
12a-7-9a-18-(a+35)=0
We add all the numbers together, and all the variables
3a-(a+35)-25=0
We get rid of parentheses
3a-a-35-25=0
We add all the numbers together, and all the variables
2a-60=0
We move all terms containing a to the left, all other terms to the right
2a=60
a=60/2
a=30
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