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3(-4) + m = 2(-4 - m) + 5
-12 + m = -8 - 2m + 5
m + 2m = -8 + 5 +12
3m = 9
m = 3
odpowiedz A jest prwidlowa
x+3m=5
-4+3m=5
3m=9
m=3
odp A