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r in (-oo:+oo)
15 = -r/6 // + -r/6
15-(-r/6) = 0
(1/6)*r+15 = 0
1/6*r+15 = 0 // - 15
1/6*r = -15 // : 1/6
r = -15/1/6
r = -90
r = -90
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