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d in (-oo:+oo)
d/12+900 = 87.5 // - 87.5
d/12-87.5+900 = 0
1/12*d+812.5 = 0 // - 812.5
1/12*d = -812.5 // : 1/12
d = -812.5/1/12
d = -9750.00039
d = -9750.00039
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