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x/4+15=21
We move all terms to the left:
x/4+15-(21)=0
We add all the numbers together, and all the variables
x/4-6=0
We multiply all the terms by the denominator
x-6*4=0
We add all the numbers together, and all the variables
x-24=0
We move all terms containing x to the left, all other terms to the right
x=24
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