31=4b-2b+9

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Solution for 31=4b-2b+9 equation: 


b in (-oo:+oo)

31 = 4*b-(2*b)+9 // - 4*b-(2*b)+9

2*b-(4*b)-9+31 = 0

2*b-4*b-9+31 = 0

22-2*b = 0 // - 22

-2*b = -22 // : -2

b = -22/(-2)

b = 11

b = 11

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