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d in (-oo:+oo)
5*(8-1*d) = 90 // - 90
5*(8-1*d)-90 = 0
5*(8-d)-90 = 0
5*(8-d)-90 = 0
-5*d-50 = 0
-5*d-50 = 0
-5*d-50 = 0 // + 50
-5*d = 50 // : -5
d = 50/(-5)
d = -10
d = -10
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