b)
[tex]6 - 4(y - 3) = 22[/tex]
[tex]6 - 4y + 12 = 22[/tex]
[tex] - 4y = 22 - 6 - 12[/tex]
[tex] - 4y = 4 | \div ( - 4)| [/tex]
[tex]y = - 1[/tex]
c)
[tex] \frac{x + 3}{5} = \frac{x - 2}{4} [/tex]
[tex]5(x - 2) = 4(x + 3)[/tex]
[tex]5x - 10 = 4x + 12[/tex]
[tex]5x - 4x = 12 + 10[/tex]
[tex]x = 22[/tex]
d)
[tex] \frac{2.4}{x} = \frac{3}{5} [/tex]
[tex]3x = 2.4 \times 5[/tex]
[tex]3x = 12 | \div 3| [/tex]
[tex]x = 4[/tex]
