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-49=2+3a
We move all terms to the left:
-49-(2+3a)=0
We add all the numbers together, and all the variables
-(3a+2)-49=0
We get rid of parentheses
-3a-2-49=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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