21=2.50-x

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Solution for 21=2.50-x equation: 



21=2.50-x

We move all terms to the left:

21-(2.50-x)=0

We add all the numbers together, and all the variables

-(-1x+2.5)+21=0

We get rid of parentheses

1x-2.5+21=0

We add all the numbers together, and all the variables

x+18.5=0

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

x=-18.5

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