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