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3x-6=5x+12+x
We move all terms to the left:
3x-6-(5x+12+x)=0
We add all the numbers together, and all the variables
3x-(6x+12)-6=0
We get rid of parentheses
3x-6x-12-6=0
We add all the numbers together, and all the variables
-3x-18=0
We move all terms containing x to the left, all other terms to the right
-3x=18
x=18/-3
x=-6
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