7d+9=-75

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Solution for 7d+9=-75 equation: 


d in (-oo:+oo)

7*d+9 = -75 // + 75

7*d+9+75 = 0

7*d+84 = 0 // - 84

7*d = -84 // : 7

d = -84/7

d = -12

d = -12

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