Pomoże ktoś? jaka liczba to x (sprawdzenia lepiej do każdych) 3)3x + 11 = 77
4)5x –4 = 21
5)21 –x = 12
6)x: 4 + 6 = 12
7)x: 6 –7 = 8
4)5x –4 = 21
5)21 –x = 12
6)x: 4 + 6 = 12
7)x: 6 –7 = 8
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