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f(x) = 4
-6x + 5 = 4
-6x = 4 -5
-6x = -1 /:(-6)
x = 1/6
spr
f(1/6) = -6*(1/6) + 5
f(1/6) = -1 + 5
f(1/6) = 4
Odp. Funkcja f(x) = -6x + 5 przyjmuje wartość równą 4 dla argumentu x=1/6