-15=2b+4b-9

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Solution for -15=2b+4b-9 equation: 


b in (-oo:+oo)

-15 = 2*b+4*b-9 // - 2*b+4*b-9

9-(2*b)-(4*b)-15 = 0

9-2*b-4*b-15 = 0

-6*b-6 = 0 // + 6

-6*b = 6 // : -6

b = 6/(-6)

b = -1

b = -1

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