-7-4d=-15

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Solution for -7-4d=-15 equation: 


d in (-oo:+oo)

-(4*d)-7 = -15 // + 15

15-(4*d)-7 = 0

15-4*d-7 = 0

8-4*d = 0 // - 8

-4*d = -8 // : -4

d = -8/(-4)

d = 2

d = 2

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