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3(2x+6+2x+3x)=12
We move all terms to the left:
3(2x+6+2x+3x)-(12)=0
We add all the numbers together, and all the variables
3(7x+6)-12=0
We multiply parentheses
21x+18-12=0
We add all the numbers together, and all the variables
21x+6=0
We move all terms containing x to the left, all other terms to the right
21x=-6
x=-6/21
x=-2/7
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