b/-3=4.2

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Solution for b/-3=4.2 equation: 


b in (-oo:+oo)

b/(-3) = 4.2 // - 4.2

b/(-3)-4.2 = 0

-1/3*b-4.2 = 0 // + 4.2

-1/3*b = 4.2 // : -1/3

b = 4.2/(-1/3)

b = -12.60000013

b = -12.60000013

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