21=x/7+20

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Solution for 21=x/7+20 equation: 



21=x/7+20

We move all terms to the left:

21-(x/7+20)=0

We get rid of parentheses

-x/7-20+21=0

We multiply all the terms by the denominator


-x-20*7+21*7=0

We add all the numbers together, and all the variables

-1x+7=0

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

-x=-7

x=-7/-1

x=+7

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