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r in (-oo:+oo)
-44 = r/20-5 // - r/20-5
5-(r/20)-44 = 0
-1/20*r-39 = 0 // + 39
-1/20*r = 39 // : -1/20
r = 39/(-1/20)
r = -780
r = -780
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