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-12-1x=2x+6+3x
We move all terms to the left:
-12-1x-(2x+6+3x)=0
We add all the numbers together, and all the variables
-1x-(5x+6)-12=0
We get rid of parentheses
-1x-5x-6-12=0
We add all the numbers together, and all the variables
-6x-18=0
We move all terms containing x to the left, all other terms to the right
-6x=18
x=18/-6
x=-3
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