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9x-7=13+4x
We move all terms to the left:
9x-7-(13+4x)=0
We add all the numbers together, and all the variables
9x-(4x+13)-7=0
We get rid of parentheses
9x-4x-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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