21=b/5

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Solution for 21=b/5 equation: 


b in (-oo:+oo)

21 = b/5 // - b/5

21-(b/5) = 0

21-1/5*b = 0 // - 21

-1/5*b = -21 // : -1/5

b = -21/(-1/5)

b = 105

b = 105

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