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f in (-oo:+oo)
75/2+80 = 2*f // - 2*f
75/2-(2*f)+80 = 0
75/2-2*f+80 = 0
235/2-2*f = 0 // - 235/2
-2*f = -235/2 // : -2
f = -235/2/(-2)
f = 235/4
f = 235/4
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