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wiec:
y=4x+2mx-8
20= 4*2+ 2m * 2 -8
20= 8+4m -8
20= 4m /:4
m= 20/4
m=5
Czyli odp c :)
20=4*2 + 2m*2-8
20=8+4m-8
20=4m
m=5