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r in (-oo:+oo)
19/3-((7/3)*r) = (4/3)*r-1 // - (4/3)*r-1
19/3-((7/3)*r)-((4/3)*r)+1 = 0
(-7/3)*r+(-4/3)*r+19/3+1 = 0
22/3-11/3*r = 0 // - 22/3
-11/3*r = -22/3 // : -11/3
r = -22/3/(-11/3)
r = 2
r = 2
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