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r in (-oo:+oo)
5*(1-3) = 10*(r/2-3) // - 10*(r/2-3)
5*(1-3)-(10*(r/2-3)) = 0
5*(1-3)-10*(r/2-3) = 0
-10*(1/2*r-3)-10 = 0
-10*(1/2*r-3)-10 = 0
20-5*r = 0
20-5*r = 0
20-5*r = 0 // - 20
-5*r = -20 // : -5
r = -20/(-5)
r = 4
r = 4
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