5b-9+7b=-129 - solution

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Solution for 5b-9+7b=-129 equation:

b in (-oo:+oo)

5*b+7*b-9 = -129 // + 129

5*b+7*b-9+129 = 0

12*b+120 = 0 // - 120

12*b = -120 // : 12

b = -120/12

b = -10

b = -10

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