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2a-3(a-7)=8a+3
We move all terms to the left:
2a-3(a-7)-(8a+3)=0
We multiply parentheses
2a-3a-(8a+3)+21=0
We get rid of parentheses
2a-3a-8a-3+21=0
We add all the numbers together, and all the variables
-9a+18=0
We move all terms containing a to the left, all other terms to the right
-9a=-18
a=-18/-9
a=+2
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