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50=300-2x
We move all terms to the left:
50-(300-2x)=0
We add all the numbers together, and all the variables
-(-2x+300)+50=0
We get rid of parentheses
2x-300+50=0
We add all the numbers together, and all the variables
2x-250=0
We move all terms containing x to the left, all other terms to the right
2x=250
x=250/2
x=125
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