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x+(18+x)=250
We move all terms to the left:
x+(18+x)-(250)=0
We add all the numbers together, and all the variables
x+(x+18)-250=0
We get rid of parentheses
x+x+18-250=0
We add all the numbers together, and all the variables
2x-232=0
We move all terms containing x to the left, all other terms to the right
2x=232
x=232/2
x=116
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