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r in (-oo:+oo)
1*((-1/2)*r-(5/7)) = 0
(-1/2)*r-5/7 = 0
-1/2*r-5/7 = 0 // + 5/7
-1/2*r = 5/7 // : -1/2
r = 5/7/(-1/2)
r = -10/7
r = -10/7
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