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r in (-oo:+oo)
(-7/3)*r = 3 // - 3
(-7/3)*r-3 = 0
-7/3*r-3 = 0 // + 3
-7/3*r = 3 // : -7/3
r = 3/(-7/3)
r = -9/7
r = -9/7
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