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50x=300+20x
We move all terms to the left:
50x-(300+20x)=0
We add all the numbers together, and all the variables
50x-(20x+300)=0
We get rid of parentheses
50x-20x-300=0
We add all the numbers together, and all the variables
30x-300=0
We move all terms containing x to the left, all other terms to the right
30x=300
x=300/30
x=10
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