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r in (-oo:+oo)
13 = -r/6 // + -r/6
13-(-r/6) = 0
(1/6)*r+13 = 0
1/6*r+13 = 0 // - 13
1/6*r = -13 // : 1/6
r = -13/1/6
r = -78
r = -78
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