20=-2b-(-3)

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Solution for 20=-2b-(-3) equation: 



20=-2b-(-3)

We move all terms to the left:

20-(-2b-(-3))=0



We calculate terms in parentheses: -(-2b-(-3)), so:

-2b-(-3)

We add all the numbers together, and all the variables

-2b+3

Back to the equation:

-(-2b+3)



We get rid of parentheses

2b-3+20=0

We add all the numbers together, and all the variables

2b+17=0

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

2b=-17

b=-17/2

b=-8+1/2

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