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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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