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90x=70x+300
We move all terms to the left:
90x-(70x+300)=0
We get rid of parentheses
90x-70x-300=0
We add all the numbers together, and all the variables
20x-300=0
We move all terms containing x to the left, all other terms to the right
20x=300
x=300/20
x=15
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