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x+(x+40)=250
We move all terms to the left:
x+(x+40)-(250)=0
We get rid of parentheses
x+x+40-250=0
We add all the numbers together, and all the variables
2x-210=0
We move all terms containing x to the left, all other terms to the right
2x=210
x=210/2
x=105
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