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d in (-oo:+oo)
6*d+9 = -5*d-68 // + -5*d-68
6*d-(-5*d)+9+68 = 0
6*d+5*d+9+68 = 0
11*d+77 = 0 // - 77
11*d = -77 // : 11
d = -77/11
d = -7
d = -7
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