54=(1/2)b*9

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Solution for 54=(1/2)b*9 equation: 


b in (-oo:+oo)

54 = 9*(1/2)*b // - 9*(1/2)*b

54-(9*(1/2)*b) = 0

(-9/2)*b+54 = 0

54-9/2*b = 0 // - 54

-9/2*b = -54 // : -9/2

b = -54/(-9/2)

b = 12

b = 12

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