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d in (-oo:+oo)
60 = (1/2)*d+15 // - (1/2)*d+15
60-((1/2)*d)-15 = 0
(-1/2)*d-15+60 = 0
45-1/2*d = 0 // - 45
-1/2*d = -45 // : -1/2
d = -45/(-1/2)
d = 90
d = 90
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