21=x*2.5

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Solution for 21=x*2.5 equation: 



21=x*2.5

We move all terms to the left:

21-(x*2.5)=0

We add all the numbers together, and all the variables

-(+x*2.5)+21=0

We get rid of parentheses

-x*2.5+21=0

Wy multiply elements

-2.5x+21=0

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

-2.5x=-21

x=-21/-2.5

x=8+1/2.5

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