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3x+7-x=-13+7x
We move all terms to the left:
3x+7-x-(-13+7x)=0
We add all the numbers together, and all the variables
3x-x-(7x-13)+7=0
We add all the numbers together, and all the variables
2x-(7x-13)+7=0
We get rid of parentheses
2x-7x+13+7=0
We add all the numbers together, and all the variables
-5x+20=0
We move all terms containing x to the left, all other terms to the right
-5x=-20
x=-20/-5
x=+4
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