4=b/21

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Solution for 4=b/21 equation: 


b in (-oo:+oo)

4 = b/21 // - b/21

4-(b/21) = 0

4-1/21*b = 0 // - 4

-1/21*b = -4 // : -1/21

b = -4/(-1/21)

b = 84

b = 84

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