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(250+x)+x=1000
We move all terms to the left:
(250+x)+x-(1000)=0
We add all the numbers together, and all the variables
(x+250)+x-1000=0
We add all the numbers together, and all the variables
x+(x+250)-1000=0
We get rid of parentheses
x+x+250-1000=0
We add all the numbers together, and all the variables
2x-750=0
We move all terms containing x to the left, all other terms to the right
2x=750
x=750/2
x=375
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