x+3x/4=21

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Solution for x+3x/4=21 equation: 



x+3x/4=21

We move all terms to the left:

x+3x/4-(21)=0

We multiply all the terms by the denominator


x*4+3x-21*4=0

We add all the numbers together, and all the variables

3x+x*4-84=0

Wy multiply elements

3x+4x-84=0

We add all the numbers together, and all the variables

7x-84=0

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

7x=84

x=84/7

x=12

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