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d in (-oo:+oo)
(1/12)*(d+900) = 87.5 // - 87.5
(1/12)*(d+900)-87.5 = 0
1/12*(d+900)-87.5 = 0
1/12*(d+900)-87.5 = 0
1/12*d-12.5 = 0
1/12*d-12.5 = 0
1/12*d-12.5 = 0 // + 12.5
1/12*d = 12.5 // : 1/12
d = 12.5/1/12
d = 150.000006
d = 150.000006
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