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17=-4+3a
We move all terms to the left:
17-(-4+3a)=0
We add all the numbers together, and all the variables
-(3a-4)+17=0
We get rid of parentheses
-3a+4+17=0
We add all the numbers together, and all the variables
-3a+21=0
We move all terms containing a to the left, all other terms to the right
-3a=-21
a=-21/-3
a=+7
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