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3a-3(75a)=-9(2a)
We move all terms to the left:
3a-3(75a)-(-9(2a))=0
We add all the numbers together, and all the variables
-372a-(-92a)=0
We get rid of parentheses
-372a+92a=0
We add all the numbers together, and all the variables
-280a=0
a=0/-280
a=0
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