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-6a-(4a-3)=83
We move all terms to the left:
-6a-(4a-3)-(83)=0
We get rid of parentheses
-6a-4a+3-83=0
We add all the numbers together, and all the variables
-10a-80=0
We move all terms containing a to the left, all other terms to the right
-10a=80
a=80/-10
a=-8
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