-40=-4(5+b)

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Solution for -40=-4(5+b) equation: 



-40=-4(5+b)

We move all terms to the left:

-40-(-4(5+b))=0

We add all the numbers together, and all the variables

-(-4(b+5))-40=0



We calculate terms in parentheses: -(-4(b+5)), so:

-4(b+5)

We multiply parentheses

-4b-20

Back to the equation:

-(-4b-20)



We get rid of parentheses

4b+20-40=0

We add all the numbers together, and all the variables

4b-20=0

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

4b=20

b=20/4

b=5

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