-7d+9=-12

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Solution for -7d+9=-12 equation: 


d in (-oo:+oo)

9-7*d = -12 // + 12

9-7*d+12 = 0

21-7*d = 0 // - 21

-7*d = -21 // : -7

d = -21/(-7)

d = 3

d = 3

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