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r in (-oo:+oo)
(-7*r)/2 = 5/12 // - 5/12
(-7*r)/2-(5/12) = 0
(-7*r)/2-5/12 = 0
-7/2*r-5/12 = 0 // + 5/12
-7/2*r = 5/12 // : -7/2
r = 5/12/(-7/2)
r = -5/42
r = -5/42
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