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