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3x+4x-7=13-3x
We move all terms to the left:
3x+4x-7-(13-3x)=0
We add all the numbers together, and all the variables
3x+4x-(-3x+13)-7=0
We add all the numbers together, and all the variables
7x-(-3x+13)-7=0
We get rid of parentheses
7x+3x-13-7=0
We add all the numbers together, and all the variables
10x-20=0
We move all terms containing x to the left, all other terms to the right
10x=20
x=20/10
x=2
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