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x+12=15.x
We move all terms to the left:
x+12-(15.x)=0
We add all the numbers together, and all the variables
x-(+15.x)+12=0
We get rid of parentheses
x-15.x+12=0
We add all the numbers together, and all the variables
-14x+12=0
We move all terms containing x to the left, all other terms to the right
-14x=-12
x=-12/-14
x=6/7
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