Odpowiedź:
zad. 3
[tex]a)7 \times x - 3 = 2 \times x - 8 \\ 7x - 3 = 2x - 8 \\ 7x - 2x = - 8 + 3 \\ 5x = - 5 \\ x = - 1[/tex]
[tex]b)10 - 2 \times x = 19 - 5 \times x \\ 10 - 2x = 19 - 5x \\ - 2x + 5x = 19 - 10 \\ 3x = 9 \\ x = 3[/tex]
[tex]c)2 \times x + 8 = 30 - 9 \times x \\ 2x + 8 = 30 - 9x \\ 2x + 9x = 30 - 8 \\ 11x = 22 \\ x = 2[/tex]
[tex]d)12 + 3 \times x = x + 18 \\ 12 + 3x = x + 18 \\ 3x - x = 18 - 12 \\ 2x = 6 \\ x = 3[/tex]
