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r in (-oo:+oo)
(1/2)*r+(5/14)*r = r-(4/7) // - r-(4/7)
(1/2)*r+(5/14)*r-r+4/7 = 0
4/7-1/7*r = 0 // - 4/7
-1/7*r = -4/7 // : -1/7
r = -4/7/(-1/7)
r = 4
r = 4
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