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f in (-oo:+oo)
9.3-(f/6.2) = 0.5 // - 0.5
9.3-(f/6.2)-0.5 = 0
9.3-0.16129032*f-0.5 = 0
8.8-0.16129032*f = 0 // - 8.8
-0.16129032*f = -8.8 // : -0.16129032
f = -8.8/(-0.16129032)
f = 54.56000087
f = 54.56000087
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