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f in (-oo:+oo)
f/5-2.2 = 2-5 // - 2-5
f/5-2.2-2+5 = 0
1/5*f+0.8 = 0 // - 0.8
1/5*f = -0.8 // : 1/5
f = -0.8/1/5
f = -4
f = -4
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