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f(4)=a/4 = -2m /*4
a=-8m
-8m/m = m-3
m-3=-8
m=-8+3
m=-5
Odp. m=-5.
m - 3 = a/m |*m
m ≠ 0
-8m = a
m(m-3) = a
m(m-3) = -8m /:m
m - 3 = -8
m = -8 + 3
m = -5