(2*10x+x)/4=21

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Solution for (2*10x+x)/4=21 equation: 



(2*10x+x)/4=21

We move all terms to the left:

(2*10x+x)/4-(21)=0

We add all the numbers together, and all the variables

(+x+2*10x)/4-21=0

We multiply all the terms by the denominator


(+x+2*10x)-21*4=0

We add all the numbers together, and all the variables

(+x+2*10x)-84=0

We get rid of parentheses

x+2*10x-84=0

Wy multiply elements

x+20x-84=0

We add all the numbers together, and all the variables

21x-84=0

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

21x=84

x=84/21

x=4

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