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f in (-oo:+oo)
9 = (1/4)*f // - (1/4)*f
9-((1/4)*f) = 0
(-1/4)*f+9 = 0
9-1/4*f = 0 // - 9
-1/4*f = -9 // : -1/4
f = -9/(-1/4)
f = 36
f = 36
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