19=-3(21-b)+2(b-4)

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Solution for 19=-3(21-b)+2(b-4) equation: 



19=-3(21-b)+2(b-4)

We move all terms to the left:

19-(-3(21-b)+2(b-4))=0

We add all the numbers together, and all the variables

-(-3(-1b+21)+2(b-4))+19=0



We calculate terms in parentheses: -(-3(-1b+21)+2(b-4)), so:

-3(-1b+21)+2(b-4)

We multiply parentheses

3b+2b-63-8

We add all the numbers together, and all the variables

5b-71

Back to the equation:

-(5b-71)



We get rid of parentheses

-5b+71+19=0

We add all the numbers together, and all the variables

-5b+90=0

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

-5b=-90

b=-90/-5

b=+18

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