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r in (-oo:+oo)
(-7/3)*r = 1 // - 1
(-7/3)*r-1 = 0
-7/3*r-1 = 0 // + 1
-7/3*r = 1 // : -7/3
r = 1/(-7/3)
r = -3/7
r = -3/7
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