-2d-1-7d=-64

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Solution for -2d-1-7d=-64 equation: 


d in (-oo:+oo)

-2*d-(7*d)-1 = -64 // + 64

64-2*d-(7*d)-1 = 0

64-2*d-7*d-1 = 0

63-9*d = 0 // - 63

-9*d = -63 // : -9

d = -63/(-9)

d = 7

d = 7

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