81=7d+d-7

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Solution for 81=7d+d-7 equation: 


d in (-oo:+oo)

81 = 7*d+d-7 // - 7*d+d-7

7-(7*d)-d+81 = 0

7-7*d-d+81 = 0

88-8*d = 0 // - 88

-8*d = -88 // : -8

d = -88/(-8)

d = 11

d = 11

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