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r in (-oo:+oo)
-3 = 11*r+68/3 // - 11*r+68/3
-(11*r)-(68/3)-3 = 0
-11*r-68/3-3 = 0
-11*r-77/3 = 0 // + 77/3
-11*r = 77/3 // : -11
r = 77/3/(-11)
r = -7/3
r = -7/3
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