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20+2x=300-2x
We move all terms to the left:
20+2x-(300-2x)=0
We add all the numbers together, and all the variables
2x-(-2x+300)+20=0
We get rid of parentheses
2x+2x-300+20=0
We add all the numbers together, and all the variables
4x-280=0
We move all terms containing x to the left, all other terms to the right
4x=280
x=280/4
x=70
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