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r in (-oo:+oo)
9832/105 = 8*((-8/3)*r+11/7) // - 8*((-8/3)*r+11/7)
9832/105-(8*((-8/3)*r+11/7)) = 0
9832/105-8*((-8/3)*r+11/7) = 0
9832/105-8*(11/7-8/3*r) = 0
(-8*105*(11/7-8/3*r))/105+9832/105 = 0
9832-8*105*(11/7-8/3*r) = 0
2240*r+8512 = 0
(2240*r+8512)/105 = 0
(2240*r+8512)/105 = 0 // * 105
2240*r+8512 = 0
2240*r+8512 = 0 // - 8512
2240*r = -8512 // : 2240
r = -8512/2240
r = -19/5
r = -19/5
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