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r in (-oo:+oo)
(2*r)/6+8/6 = (5*r)/14-(1/14) // - (5*r)/14-(1/14)
(2*r)/6-((5*r)/14)+8/6+1/14 = 0
(2*r)/6+(-5/14)*r+8/6+1/14 = 0
59/42-1/42*r = 0 // - 59/42
-1/42*r = -59/42 // : -1/42
r = -59/42/(-1/42)
r = 59
r = 59
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