[tex]2(x + 3) = x - 9 \\ 2x + 6 = x - 9 | - 6 \\ 2x = x - 15 | - x \\ x = - 15[/tex]
Odpowiedź:
2(x+3) = x - 9
2x + 6 = x - 9
x + 6 = -9
x + 15 = 0;
x = - 15
