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5a-3+7-8a=-3a+4
We move all terms to the left:
5a-3+7-8a-(-3a+4)=0
We add all the numbers together, and all the variables
-3a-(-3a+4)+4=0
We get rid of parentheses
-3a+3a-4+4=0
We add all the numbers together, and all the variables
=0
a=0/1
a=0
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