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d in (-oo:+oo)
58 = -5*d-d-8 // + -5*d-d-8
d-(-5*d)+8+58 = 0
5*d+d+8+58 = 0
6*d+66 = 0 // - 66
6*d = -66 // : 6
d = -66/6
d = -11
d = -11
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