-b+4=7b-20

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Solution for -b+4=7b-20 equation: 


b in (-oo:+oo)

4-b = 7*b-20 // - 7*b-20

4-b-(7*b)+20 = 0

4-b-7*b+20 = 0

24-8*b = 0 // - 24

-8*b = -24 // : -8

b = -24/(-8)

b = 3

b = 3

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