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r in (-oo:+oo)
r-9*r-(-2/3) = -16/3 // + -16/3
r-9*r-(-2/3)-(-16/3) = 0
r-9*r+2/3+16/3 = 0
6-8*r = 0 // - 6
-8*r = -6 // : -8
r = -6/(-8)
r = 3/4
r = 3/4
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