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20x-30=15x+35
We move all terms to the left:
20x-30-(15x+35)=0
We get rid of parentheses
20x-15x-35-30=0
We add all the numbers together, and all the variables
5x-65=0
We move all terms containing x to the left, all other terms to the right
5x=65
x=65/5
x=13
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