-4b+9=21

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Solution for -4b+9=21 equation: 


b in (-oo:+oo)

9-4*b = 21 // - 21

9-4*b-21 = 0

-4*b-12 = 0 // + 12

-4*b = 12 // : -4

b = 12/(-4)

b = -3

b = -3

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