30=4/7b

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Solution for 30=4/7b equation: 


b in (-oo:+oo)

30 = (4/7)*b // - (4/7)*b

30-((4/7)*b) = 0

(-4/7)*b+30 = 0

30-4/7*b = 0 // - 30

-4/7*b = -30 // : -4/7

b = -30/(-4/7)

b = 105/2

b = 105/2

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