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x+(x+90)=250
We move all terms to the left:
x+(x+90)-(250)=0
We get rid of parentheses
x+x+90-250=0
We add all the numbers together, and all the variables
2x-160=0
We move all terms containing x to the left, all other terms to the right
2x=160
x=160/2
x=80
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