a)
[tex] \frac{1}{3} x = 3 | \times 3 \\ x = 9[/tex]
b)
[tex] \frac{3}{4} x = - \frac{4}{9} | \times 4 \\ 3x = - \frac{16}{9} | \div 3 \\ x = - \frac{16}{9} \times \frac{1}{3} \\x = - \frac{16}{27} [/tex]
c)
[tex] \frac{1}{3} x - 2 = x + 2 | + 2 \\ \frac{1}{3} x = x + 4 | - x \\ - \frac{2}{3} x = 4 | \times 3 \\ - 2 = 12 | \div ( - 2) \\ x = - 6[/tex]
d)
[tex]6( \frac{1}{4} x - 2) = 18 \\ \frac{6}{4} x - 12 = 18 | + 12 \\ \frac{6}{4} x = 30 | \times 4 \\ 6x = 120 | \div 6 \\ x = 20[/tex]
e)
[tex] \frac{2}{5} (3 - x) = - 2 \\ \frac{6}{5} - \frac{2}{5} x = - 2 | - \frac{6}{5} \\ - \frac{2}{5} x = - 2 \frac{6}{5} | \times 5 \\ - 2x = - \frac{16}{5} \times 5 \\ - 2x = - 16 | \div ( - 2) \\ x = 8[/tex]
