20=15-b

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Solution for 20=15-b equation: 



20=15-b

We move all terms to the left:

20-(15-b)=0

We add all the numbers together, and all the variables

-(-1b+15)+20=0

We get rid of parentheses

1b-15+20=0

We add all the numbers together, and all the variables

b+5=0

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

b=-5

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