84=7d+6d-7

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Solution for 84=7d+6d-7 equation: 


d in (-oo:+oo)

84 = 7*d+6*d-7 // - 7*d+6*d-7

7-(7*d)-(6*d)+84 = 0

7-7*d-6*d+84 = 0

91-13*d = 0 // - 91

-13*d = -91 // : -13

d = -91/(-13)

d = 7

d = 7

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