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