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6x+13-3x-7=-3x+20
We move all terms to the left:
6x+13-3x-7-(-3x+20)=0
We add all the numbers together, and all the variables
3x-(-3x+20)+6=0
We get rid of parentheses
3x+3x-20+6=0
We add all the numbers together, and all the variables
6x-14=0
We move all terms containing x to the left, all other terms to the right
6x=14
x=14/6
x=2+1/3
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