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3 = 5*4− m + 3
m=20+3-3=20 zatemA
3=5*4-m+3
m=20+3-3
m=20
odp A
3=5*4-m+3
3=20-m+3
-23+3=-m
-20=-m /(-1)
m=20
/ mnożenie obustronne
* mnożenie
odp. A