-2b+9=21

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Solution for -2b+9=21 equation: 


b in (-oo:+oo)

9-2*b = 21 // - 21

9-2*b-21 = 0

-2*b-12 = 0 // + 12

-2*b = 12 // : -2

b = 12/(-2)

b = -6

b = -6

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