21=x/2+20

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Solution for 21=x/2+20 equation: 



21=x/2+20

We move all terms to the left:

21-(x/2+20)=0

We get rid of parentheses

-x/2-20+21=0

We multiply all the terms by the denominator


-x-20*2+21*2=0

We add all the numbers together, and all the variables

-1x+2=0

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

-x=-2

x=-2/-1

x=+2

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