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