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