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3(4x+3)+81=15x+6-3x+84
We move all terms to the left:
3(4x+3)+81-(15x+6-3x+84)=0
We add all the numbers together, and all the variables
3(4x+3)-(12x+90)+81=0
We multiply parentheses
12x-(12x+90)+9+81=0
We get rid of parentheses
12x-12x-90+9+81=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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