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