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x+(x+70)+(2x-150)=1900
We move all terms to the left:
x+(x+70)+(2x-150)-(1900)=0
We get rid of parentheses
x+x+2x+70-150-1900=0
We add all the numbers together, and all the variables
4x-1980=0
We move all terms containing x to the left, all other terms to the right
4x=1980
x=1980/4
x=495
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