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x=12+x*3
We move all terms to the left:
x-(12+x*3)=0
We add all the numbers together, and all the variables
x-(x*3+12)=0
We get rid of parentheses
x-x*3-12=0
Wy multiply elements
x-3x-12=0
We add all the numbers together, and all the variables
-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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