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r in (-oo:+oo)
(-3/5)*(20*r-5)-(-6*r) = 0
(-3/5)*(20*r-5)+6*r = 0
6*r-3/5*(20*r-5) = 0
6*r-3/5*(20*r-5) = 0
3-6*r = 0
3-6*r = 0
3-6*r = 0 // - 3
-6*r = -3 // : -6
r = -3/(-6)
r = 1/2
r = 1/2
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