-1+d-7d=-49

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Solution for -1+d-7d=-49 equation: 


d in (-oo:+oo)

d-(7*d)-1 = -49 // + 49

d-(7*d)-1+49 = 0

d-7*d-1+49 = 0

48-6*d = 0 // - 48

-6*d = -48 // : -6

d = -48/(-6)

d = 8

d = 8

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