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f in (-oo:+oo)
15 = (-5/6)*f // - (-5/6)*f
15-((-5/6)*f) = 0
(5/6)*f+15 = 0
5/6*f+15 = 0 // - 15
5/6*f = -15 // : 5/6
f = -15/5/6
f = -18
f = -18
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