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d in (-oo:+oo)
2*(5*d+5) = 60 // - 60
2*(5*d+5)-60 = 0
2*(5*d+5)-60 = 0
10*d-50 = 0
10*d-50 = 0
10*d-50 = 0 // + 50
10*d = 50 // : 10
d = 50/10
d = 5
d = 5
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