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2x/3+20=100
We move all terms to the left:
2x/3+20-(100)=0
We add all the numbers together, and all the variables
2x/3-80=0
We multiply all the terms by the denominator
2x-80*3=0
We add all the numbers together, and all the variables
2x-240=0
We move all terms containing x to the left, all other terms to the right
2x=240
x=240/2
x=120
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