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2x+90=210-x
We move all terms to the left:
2x+90-(210-x)=0
We add all the numbers together, and all the variables
2x-(-1x+210)+90=0
We get rid of parentheses
2x+1x-210+90=0
We add all the numbers together, and all the variables
3x-120=0
We move all terms containing x to the left, all other terms to the right
3x=120
x=120/3
x=40
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