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-57=-6+3a
We move all terms to the left:
-57-(-6+3a)=0
We add all the numbers together, and all the variables
-(3a-6)-57=0
We get rid of parentheses
-3a+6-57=0
We add all the numbers together, and all the variables
-3a-51=0
We move all terms containing a to the left, all other terms to the right
-3a=51
a=51/-3
a=-17
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