7d-7+d=-79

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Solution for 7d-7+d=-79 equation: 


d in (-oo:+oo)

7*d+d-7 = -79 // + 79

7*d+d-7+79 = 0

8*d+72 = 0 // - 72

8*d = -72 // : 8

d = -72/8

d = -9

d = -9

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