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7x+20=2x+40
We move all terms to the left:
7x+20-(2x+40)=0
We get rid of parentheses
7x-2x-40+20=0
We add all the numbers together, and all the variables
5x-20=0
We move all terms containing x to the left, all other terms to the right
5x=20
x=20/5
x=4
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