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500-30x=300+20x
We move all terms to the left:
500-30x-(300+20x)=0
We add all the numbers together, and all the variables
-30x-(20x+300)+500=0
We get rid of parentheses
-30x-20x-300+500=0
We add all the numbers together, and all the variables
-50x+200=0
We move all terms containing x to the left, all other terms to the right
-50x=-200
x=-200/-50
x=+4
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