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