-72=3b+4b+5

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Solution for -72=3b+4b+5 equation: 


b in (-oo:+oo)

-72 = 3*b+4*b+5 // - 3*b+4*b+5

-(3*b)-(4*b)-72-5 = 0

-3*b-4*b-72-5 = 0

-7*b-77 = 0 // + 77

-7*b = 77 // : -7

b = 77/(-7)

b = -11

b = -11

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