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d in (-oo:+oo)
(3/11)*d+(9/11)*d = -48 // + 48
(3/11)*d+(9/11)*d+48 = 0
12/11*d+48 = 0 // - 48
12/11*d = -48 // : 12/11
d = -48/12/11
d = -44
d = -44
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