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r in (-oo:+oo)
-((5*r)/(-3))-3/3 = 18 // - 18
-((5*r)/(-3))-3/3-18 = 0
(5/3)*r-3/3-18 = 0
5/3*r-19 = 0 // + 19
5/3*r = 19 // : 5/3
r = 19/5/3
r = 57/5
r = 57/5
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