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f in (-oo:+oo)
f/20-4 = 4.9 // - 4.9
f/20-4.9-4 = 0
1/20*f-8.9 = 0 // + 8.9
1/20*f = 8.9 // : 1/20
f = 8.9/1/20
f = 178
f = 178
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