9+3b+7b=49

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Solution for 9+3b+7b=49 equation: 


b in (-oo:+oo)

3*b+7*b+9 = 49 // - 49

3*b+7*b-49+9 = 0

10*b-40 = 0 // + 40

10*b = 40 // : 10

b = 40/10

b = 4

b = 4

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