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r in (-oo:+oo)
14 = -r/8 // + -r/8
14-(-r/8) = 0
(1/8)*r+14 = 0
1/8*r+14 = 0 // - 14
1/8*r = -14 // : 1/8
r = -14/1/8
r = -112
r = -112
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