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21a-7-9(a-2)=a+35
We move all terms to the left:
21a-7-9(a-2)-(a+35)=0
We multiply parentheses
21a-9a-(a+35)+18-7=0
We get rid of parentheses
21a-9a-a-35+18-7=0
We add all the numbers together, and all the variables
11a-24=0
We move all terms containing a to the left, all other terms to the right
11a=24
a=24/11
a=2+2/11
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