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d in (-oo:+oo)
d-((4/5)*d)-8 = -48/5 // + -48/5
d-((4/5)*d)-(-48/5)-8 = 0
(-4/5)*d+d+48/5-8 = 0
1/5*d+8/5 = 0 // - 8/5
1/5*d = -8/5 // : 1/5
d = -8/5/1/5
d = -8
d = -8
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