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