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12x/4+4x=21
We move all terms to the left:
12x/4+4x-(21)=0
We add all the numbers together, and all the variables
4x+12x/4-21=0
We multiply all the terms by the denominator
4x*4+12x-21*4=0
We add all the numbers together, and all the variables
12x+4x*4-84=0
Wy multiply elements
12x+16x-84=0
We add all the numbers together, and all the variables
28x-84=0
We move all terms containing x to the left, all other terms to the right
28x=84
x=84/28
x=3
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