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68=18+x
We move all terms to the left:
68-(18+x)=0
We add all the numbers together, and all the variables
-(x+18)+68=0
We get rid of parentheses
-x-18+68=0
We add all the numbers together, and all the variables
-1x+50=0
We move all terms containing x to the left, all other terms to the right
-x=-50
x=-50/-1
x=+50
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