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r in (-oo:+oo)
(1/6)*(4*r-60) = 4*r // - 4*r
(1/6)*(4*r-60)-(4*r) = 0
(1/6)*(4*r-60)-4*r = 0
1/6*(4*r-60)-4*r = 0
1/6*(4*r-60)-4*r = 0
-10/3*r-10 = 0
-10/3*r-10 = 0
-10/3*r-10 = 0 // + 10
-10/3*r = 10 // : -10/3
r = 10/(-10/3)
r = -3
r = -3
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