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4x/7=3
We move all terms to the left:
4x/7-(3)=0
We multiply all the terms by the denominator
4x-3*7=0
We add all the numbers together, and all the variables
4x-21=0
We move all terms containing x to the left, all other terms to the right
4x=21
x=21/4
x=5+1/4
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