21=x/4-9

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Solution for 21=x/4-9 equation: 



21=x/4-9

We move all terms to the left:

21-(x/4-9)=0

We get rid of parentheses

-x/4+9+21=0

We multiply all the terms by the denominator


-x+9*4+21*4=0

We add all the numbers together, and all the variables

-1x+120=0

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

-x=-120

x=-120/-1

x=+120

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