1)

[tex](x + \frac{12}{5} ) \times \frac{1}{8} = 2.3[/tex]

[tex] \frac{5x + 12}{40} = 2.3[/tex]

[tex]5x + 12 = 92[/tex]

[tex]5x = 92 -12[/tex]

[tex]5x = 80[/tex]

[tex]x = 16[/tex]

2)

[tex]8x = 5.6 + 3.2 = 8.8[/tex]

[tex]x = 1.1[/tex]

3)

[tex]11x + 1.8 = 9.5[/tex]

[tex]11x = 9.5 - 1.8 = 7.7[/tex]

[tex]x = 0.7[/tex]

4)

[tex]12.5y = 1[/tex]

[tex]y = 0.08[/tex]

5)

[tex]13.6y = 1.8 + 3.64 = 5.44[/tex]

[tex]y = 0.4[/tex]