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f in (-oo:+oo)
2.9*f-(5.1/2) = 4.7 // - 4.7
2.9*f-(5.1/2)-4.7 = 0
2.9*f-4.7-2.55 = 0
2.9*f-7.25 = 0 // + 7.25
2.9*f = 7.25 // : 2.9
f = 7.25/2.9
f = 2.5
f = 2.5
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