7/8=21/-2b

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Solution for 7/8=21/-2b equation: 


b in (-oo:+oo)

7/8 = (21/(-2))*b // - (21/(-2))*b

7/8-((21/(-2))*b) = 0

(21/2)*b+7/8 = 0

21/2*b+7/8 = 0 // - 7/8

21/2*b = -7/8 // : 21/2

b = -7/8/21/2

b = -1/12

b = -1/12

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