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9+2x/3=13
We move all terms to the left:
9+2x/3-(13)=0
We add all the numbers together, and all the variables
2x/3-4=0
We multiply all the terms by the denominator
2x-4*3=0
We add all the numbers together, and all the variables
2x-12=0
We move all terms containing x to the left, all other terms to the right
2x=12
x=12/2
x=6
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