4d-9=-13

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Solution for 4d-9=-13 equation: 


d in (-oo:+oo)

4*d-9 = -13 // + 13

4*d-9+13 = 0

4*d+4 = 0 // - 4

4*d = -4 // : 4

d = -4/4

d = -1

d = -1

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