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7x-2x=3x-20
We move all terms to the left:
7x-2x-(3x-20)=0
We add all the numbers together, and all the variables
5x-(3x-20)=0
We get rid of parentheses
5x-3x+20=0
We add all the numbers together, and all the variables
2x+20=0
We move all terms containing x to the left, all other terms to the right
2x=-20
x=-20/2
x=-10
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