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x/3+2x/3=5
We move all terms to the left:
x/3+2x/3-(5)=0
We multiply all the terms by the denominator
x+2x-5*3=0
We add all the numbers together, and all the variables
3x-15=0
We move all terms containing x to the left, all other terms to the right
3x=15
x=15/3
x=5
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