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-6=7.5a
We move all terms to the left:
-6-(7.5a)=0
We add all the numbers together, and all the variables
-(+7.5a)-6=0
We get rid of parentheses
-7.5a-6=0
We move all terms containing a to the left, all other terms to the right
-7.5a=6
a=6/-7.5
a=-6/7.5
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