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3(2x+7)=11x+12-5x+9
We move all terms to the left:
3(2x+7)-(11x+12-5x+9)=0
We add all the numbers together, and all the variables
3(2x+7)-(6x+21)=0
We multiply parentheses
6x-(6x+21)+21=0
We get rid of parentheses
6x-6x-21+21=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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