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7x-20=4x+35
We move all terms to the left:
7x-20-(4x+35)=0
We get rid of parentheses
7x-4x-35-20=0
We add all the numbers together, and all the variables
3x-55=0
We move all terms containing x to the left, all other terms to the right
3x=55
x=55/3
x=18+1/3
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