(x+21)/2=4x

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



(x+21)/2=4x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We multiply all the terms by the denominator


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

Wy multiply elements

-8x+(x+21)=0

We get rid of parentheses

-8x+x+21=0

We add all the numbers together, and all the variables

-7x+21=0

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

-7x=-21

x=-21/-7

x=+3

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