X+x/3=21

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Solution for X+x/3=21 equation: 



X+X/3=21

We move all terms to the left:

X+X/3-(21)=0

We multiply all the terms by the denominator


X*3+X-21*3=0

We add all the numbers together, and all the variables

X+X*3-63=0

Wy multiply elements

X+3X-63=0

We add all the numbers together, and all the variables

4X-63=0

We move all terms containing X to the left, all other terms to the right

4X=63

X=63/4

X=15+3/4

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