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6(2a-7)=-102
We move all terms to the left:
6(2a-7)-(-102)=0
We add all the numbers together, and all the variables
6(2a-7)+102=0
We multiply parentheses
12a-42+102=0
We add all the numbers together, and all the variables
12a+60=0
We move all terms containing a to the left, all other terms to the right
12a=-60
a=-60/12
a=-5
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