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r in (-oo:+oo)
(-2/3)*r+5 = 0-((1/3)*r) // - 0-((1/3)*r)
(-2/3)*r+(1/3)*r+0+5 = 0
(-2/3)*r+(1/3)*r+5 = 0
5-1/3*r = 0 // - 5
-1/3*r = -5 // : -1/3
r = -5/(-1/3)
r = 15
r = 15
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