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8a+3a-2a+12-51=10a-42+a-7a+35
We move all terms to the left:
8a+3a-2a+12-51-(10a-42+a-7a+35)=0
We add all the numbers together, and all the variables
8a+3a-2a-(4a-7)+12-51=0
We add all the numbers together, and all the variables
9a-(4a-7)-39=0
We get rid of parentheses
9a-4a+7-39=0
We add all the numbers together, and all the variables
5a-32=0
We move all terms containing a to the left, all other terms to the right
5a=32
a=32/5
a=6+2/5
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