9-4b=13

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Solution for 9-4b=13 equation: 


b in (-oo:+oo)

9-(4*b) = 13 // - 13

9-(4*b)-13 = 0

9-4*b-13 = 0

-4*b-4 = 0 // + 4

-4*b = 4 // : -4

b = 4/(-4)

b = -1

b = -1

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