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(2x+100)+x=850
We move all terms to the left:
(2x+100)+x-(850)=0
We add all the numbers together, and all the variables
x+(2x+100)-850=0
We get rid of parentheses
x+2x+100-850=0
We add all the numbers together, and all the variables
3x-750=0
We move all terms containing x to the left, all other terms to the right
3x=750
x=750/3
x=250
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