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f in (-oo:+oo)
f/3-6.28 = -5.72 // + 5.72
f/3-6.28+5.72 = 0
1/3*f-0.56 = 0 // + 0.56
1/3*f = 0.56 // : 1/3
f = 0.56/1/3
f = 1.68000002
f = 1.68000002
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