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6x-(3x+18)=12x
We move all terms to the left:
6x-(3x+18)-(12x)=0
We add all the numbers together, and all the variables
-6x-(3x+18)=0
We get rid of parentheses
-6x-3x-18=0
We add all the numbers together, and all the variables
-9x-18=0
We move all terms containing x to the left, all other terms to the right
-9x=18
x=18/-9
x=-2
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