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r in (-oo:+oo)
2/5-(3*r) = 2 // - 2
2/5-(3*r)-2 = 0
2/5-3*r-2 = 0
-3*r-8/5 = 0 // + 8/5
-3*r = 8/5 // : -3
r = 8/5/(-3)
r = -8/15
r = -8/15
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