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6x-20=7x+x-3x
We move all terms to the left:
6x-20-(7x+x-3x)=0
We add all the numbers together, and all the variables
6x-(+5x)-20=0
We get rid of parentheses
6x-5x-20=0
We add all the numbers together, and all the variables
x-20=0
We move all terms containing x to the left, all other terms to the right
x=20
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