20=2.5-x

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Solution for 20=2.5-x equation: 



20=2.5-x

We move all terms to the left:

20-(2.5-x)=0

We add all the numbers together, and all the variables

-(-1x+2.5)+20=0

We get rid of parentheses

1x-2.5+20=0

We add all the numbers together, and all the variables

x+17.5=0

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

x=-17.5

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