-9+4b=7b+21

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Solution for -9+4b=7b+21 equation: 


b in (-oo:+oo)

4*b-9 = 7*b+21 // - 7*b+21

4*b-(7*b)-21-9 = 0

4*b-7*b-21-9 = 0

-3*b-30 = 0 // + 30

-3*b = 30 // : -3

b = 30/(-3)

b = -10

b = -10

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