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d in (-oo:+oo)
2*(5*d+1) = -58 // + 58
2*(5*d+1)+58 = 0
2*(5*d+1)+58 = 0
10*d+60 = 0
10*d+60 = 0
10*d+60 = 0 // - 60
10*d = -60 // : 10
d = -60/10
d = -6
d = -6
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