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f in (-oo:+oo)
6-((2*f)/5) = 12 // - 12
6-((2*f)/5)-12 = 0
(-2/5)*f-12+6 = 0
-2/5*f-6 = 0 // + 6
-2/5*f = 6 // : -2/5
f = 6/(-2/5)
f = -15
f = -15
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