20.5=25.5-20+b

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Solution for 20.5=25.5-20+b equation: 



20.5=25.5-20+b

We move all terms to the left:

20.5-(25.5-20+b)=0

We add all the numbers together, and all the variables

-(b+5.5)+20.5=0

We get rid of parentheses

-b-5.5+20.5=0

We add all the numbers together, and all the variables

-1b+15=0

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

-b=-15

b=-15/-1

b=+15

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