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20+x/3=27
We move all terms to the left:
20+x/3-(27)=0
We add all the numbers together, and all the variables
x/3-7=0
We multiply all the terms by the denominator
x-7*3=0
We add all the numbers together, and all the variables
x-21=0
We move all terms containing x to the left, all other terms to the right
x=21
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