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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+0.3 = 0 // - 0.3
1/5*F = -0.3 // : 1/5
F = -0.3/1/5
F = -1.5
F = -1.5
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