20=-b/2

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Solution for 20=-b/2 equation: 



20=-b/2

We move all terms to the left:

20-(-b/2)=0

We get rid of parentheses

b/2+20=0

We multiply all the terms by the denominator


b+20*2=0

We add all the numbers together, and all the variables

b+40=0

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

b=-40

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