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120+2x=320-2x
We move all terms to the left:
120+2x-(320-2x)=0
We add all the numbers together, and all the variables
2x-(-2x+320)+120=0
We get rid of parentheses
2x+2x-320+120=0
We add all the numbers together, and all the variables
4x-200=0
We move all terms containing x to the left, all other terms to the right
4x=200
x=200/4
x=50
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