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r in (-oo:+oo)
19-((2/5)*r) = 34 // - 34
19-((2/5)*r)-34 = 0
(-2/5)*r-34+19 = 0
-2/5*r-15 = 0 // + 15
-2/5*r = 15 // : -2/5
r = 15/(-2/5)
r = -75/2
r = -75/2
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