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d in (-oo:+oo)
3-((2*d)/5)+4 = 9 // - 9
3-((2*d)/5)-9+4 = 0
(-2/5)*d-9+3+4 = 0
-2/5*d-2 = 0 // + 2
-2/5*d = 2 // : -2/5
d = 2/(-2/5)
d = -5
d = -5
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