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X/3+4X=91
We move all terms to the left:
X/3+4X-(91)=0
We add all the numbers together, and all the variables
4X+X/3-91=0
We multiply all the terms by the denominator
4X*3+X-91*3=0
We add all the numbers together, and all the variables
X+4X*3-273=0
Wy multiply elements
X+12X-273=0
We add all the numbers together, and all the variables
13X-273=0
We move all terms containing X to the left, all other terms to the right
13X=273
X=273/13
X=21
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