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18+7-x=12-112
We move all terms to the left:
18+7-x-(12-112)=0
We add all the numbers together, and all the variables
-x+18+7-(-100)=0
We add all the numbers together, and all the variables
-1x+125=0
We move all terms containing x to the left, all other terms to the right
-x=-125
x=-125/-1
x=+125
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