Odpowiedź:
[tex]7 - 3x = 8 - 8x \\ - 3x + 8x = 8 - 7 \\ 5x = 1 \\ x = \frac{1}{5} [/tex]
[tex]7-3x=-8-8x\\\\-3x+8x=-8-7\\\\5x=-15\ \ /:5\\\\x=-3[/tex]