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7x+5-4x=x+13
We move all terms to the left:
7x+5-4x-(x+13)=0
We add all the numbers together, and all the variables
3x-(x+13)+5=0
We get rid of parentheses
3x-x-13+5=0
We add all the numbers together, and all the variables
2x-8=0
We move all terms containing x to the left, all other terms to the right
2x=8
x=8/2
x=4
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