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r in (-oo:+oo)
r/5-3 = (2*r)/5+16 // - (2*r)/5+16
r/5-((2*r)/5)-16-3 = 0
r/5+(-2/5)*r-16-3 = 0
-1/5*r-19 = 0 // + 19
-1/5*r = 19 // : -1/5
r = 19/(-1/5)
r = -95
r = -95
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