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5x-40+2x+20=5x-40+2x+20
We move all terms to the left:
5x-40+2x+20-(5x-40+2x+20)=0
We add all the numbers together, and all the variables
5x+2x-(7x-20)-40+20=0
We add all the numbers together, and all the variables
7x-(7x-20)-20=0
We get rid of parentheses
7x-7x+20-20=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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