50=-2(21-b)+4(b-4)

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Solution for 50=-2(21-b)+4(b-4) equation: 



50=-2(21-b)+4(b-4)

We move all terms to the left:

50-(-2(21-b)+4(b-4))=0

We add all the numbers together, and all the variables

-(-2(-1b+21)+4(b-4))+50=0



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

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

We multiply parentheses

2b+4b-42-16

We add all the numbers together, and all the variables

6b-58

Back to the equation:

-(6b-58)



We get rid of parentheses

-6b+58+50=0

We add all the numbers together, and all the variables

-6b+108=0

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

-6b=-108

b=-108/-6

b=+18

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