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12-7x=18-x
We move all terms to the left:
12-7x-(18-x)=0
We add all the numbers together, and all the variables
-7x-(-1x+18)+12=0
We get rid of parentheses
-7x+1x-18+12=0
We add all the numbers together, and all the variables
-6x-6=0
We move all terms containing x to the left, all other terms to the right
-6x=6
x=6/-6
x=-1
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