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12x/5=21
We move all terms to the left:
12x/5-(21)=0
We multiply all the terms by the denominator
12x-21*5=0
We add all the numbers together, and all the variables
12x-105=0
We move all terms containing x to the left, all other terms to the right
12x=105
x=105/12
x=8+3/4
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