D/4-9=-13 - solution

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Solution for D/4-9=-13 equation:

D in (-oo:+oo)

D/4-9 = -13 // + 13

D/4-9+13 = 0

1/4*D+4 = 0 // - 4

1/4*D = -4 // : 1/4

D = -4/1/4

D = -16

D = -16

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