a)
[tex]9 + x = 1 \frac{7}{8} [/tex]
[tex]x = 1 \frac{7}{8} - 9[/tex]
[tex]x = \frac{15}{8} - \frac{72}{8} = - \frac{57}{8} = - 7 \frac{1}{8} [/tex]
b)
[tex] - 8y = 5 | \div ( - 8)[/tex]
[tex]y = - \frac{5}{8} [/tex]
c)
[tex]x - \frac{4}{5} = 0.8[/tex]
[tex]x = 0.8 + \frac{4}{5} = \frac{4}{5} + \frac{4}{5} = \frac{8}{5} = 1 \frac{3}{5} [/tex]
d)
[tex]6 \frac{1}{8} y = 1[/tex]
[tex] \frac{49}{8}y = 1 | \times \frac{8}{49} [/tex]
[tex]y = \frac{8}{49} [/tex]
e)
[tex] - \frac{1}{3}y = 10 | \times ( - 3)[/tex]
[tex]y = - 30[/tex]
f)
[tex] - \frac{3}{4} - \frac{1}{4}l = 2.25[/tex]
[tex] - \frac{1}{4}l = 2 \frac{1}{4} + \frac{3}{4} [/tex]
[tex] - \frac{1}{4}l = 3 | \times ( - 4)[/tex]
[tex]l = - 12[/tex]
