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3x/4+3=21
We move all terms to the left:
3x/4+3-(21)=0
We add all the numbers together, and all the variables
3x/4-18=0
We multiply all the terms by the denominator
3x-18*4=0
We add all the numbers together, and all the variables
3x-72=0
We move all terms containing x to the left, all other terms to the right
3x=72
x=72/3
x=24
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