25=40-3b

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Solution for 25=40-3b equation: 



25=40-3b

We move all terms to the left:

25-(40-3b)=0

We add all the numbers together, and all the variables

-(-3b+40)+25=0

We get rid of parentheses

3b-40+25=0

We add all the numbers together, and all the variables

3b-15=0

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

3b=15

b=15/3

b=5

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