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r in (-oo:+oo)
-7 = r/3-3 // - r/3-3
3-(r/3)-7 = 0
-1/3*r-4 = 0 // + 4
-1/3*r = 4 // : -1/3
r = 4/(-1/3)
r = -12
r = -12
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