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x/4-21=4
We move all terms to the left:
x/4-21-(4)=0
We add all the numbers together, and all the variables
x/4-25=0
We multiply all the terms by the denominator
x-25*4=0
We add all the numbers together, and all the variables
x-100=0
We move all terms containing x to the left, all other terms to the right
x=100
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