Odpowiedź:
1.
[tex] - 5x + 15 = 60[/tex]
[tex] - 5x = 60 - 15[/tex]
[tex] - 5x = 45 \: \: \: | \div ( - 5)| [/tex]
[tex]x = - 9[/tex]
2.
[tex]9x - 5 = 6x + 13[/tex]
[tex]9x - 6x = 13 + 5[/tex]
[tex]3x = 18[/tex]
[tex]x = 6[/tex]
3.
[tex] \frac{1}{5}x+ 2 \: = \: \frac{4}{5} x - 4 \: \: \: \: | \times 5 |[/tex]
[tex]1x + 10 = 4x - 20[/tex]
[tex]1x - 4x = - 20 - 10[/tex]
[tex] - 3x = - 30 \: \: \: \: | \div ( - 3)| [/tex]
[tex]x = 10[/tex]
4.
[tex]4(x + 3) - 3(7 - 4x) = 1[/tex]
[tex]4x + 12 - 21 + 12x = 1[/tex]
[tex]4x + 12x = 1 - 12 + 21[/tex]
[tex]16x = 10 \: \: \: | \div 16| [/tex]
[tex]x = \frac{10}{16} = \frac{5}{8} [/tex]
5.
[tex] \frac{x + 2}{8} + \frac{x + 3}{4} = - 5 \: \: \: | \times 8| [/tex]
[tex]x + 2 + 2x + 3 = - 5[/tex]
[tex]x + 2x = - 5 - 2 - 3[/tex]
[tex]3x = - 10 \: \: \: | \div 3| [/tex]
[tex]x = - \frac{3}{10} [/tex]
Proszę:)
