20.5=a-2.5

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Solution for 20.5=a-2.5 equation: 



20.5=a-2.5

We move all terms to the left:

20.5-(a-2.5)=0

We get rid of parentheses

-a+2.5+20.5=0

We add all the numbers together, and all the variables

-1a+23=0

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

-a=-23

a=-23/-1

a=+23

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