Odpowiedź :
[tex]2x + 7 = 13 \\ 2x = 13 - 7 \\ 2x = 6 \\ x = 3[/tex]
[tex]6 + 3c = 15 \\ 3c = 15 - 6 \\ 3c = 9 \\ c = 3[/tex]
[tex]8 - 4a = - 24 \\ - 4a = - 24 - 8 \\ - 4a = - 32 \\ a = 8[/tex]
[tex]9x - 7 = 3x + 5 \\ 9x - 3x = 5 + 7 \\ 6x = 12 \\ x = 2[/tex]
Sprawdzenie :
[tex]9x - 7 = 3x + 5 \\ 9 \times 2 - 7 = 3 \times 2 + 5 \\ 18 - 7 = 6 + 5 \\ 11 = 11[/tex]
L=P
Pozdrowionka! ~Wika