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3(6=3a)-a=-2(9-4a)
We move all terms to the left:
3(6-(3a)-a)=0
We add all the numbers together, and all the variables
3(-4a+6)=0
We multiply parentheses
-12a+18=0
We move all terms containing a to the left, all other terms to the right
-12a=-18
a=-18/-12
a=1+1/2
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