$4x + 6 = 58$
$\frac{3}{4}x - \frac{1}{2}x = \frac{1}{5}$
$80\%x - \frac{5}{6} + 50\% = 75\%$
$7x - 1.4x = 56$
$\frac{x}{21} = \frac{4}{9}:\frac{1}{6}$
$\frac{5}{6}:x = \frac{3}{4}:\frac{2}{5}$
$75\%x - 25\%x = 76$
$8:0.3 = x:0.9$
$68x \div 0.2 = 17$
$x \div (1 - 12.5\%) = 560$
$\frac{1.8}{x} = \frac{7.2}{0.8}$
$2x - 60\% \div 30 = 18.98$
$1.6:x = \frac{2}{5}:\frac{3}{10}$
$9:6 = 4.5:x$
$30:x = 54:36$

$30 - (4 - 0.25) \div 1.5$
$\frac{1}{5} + \frac{7}{20} \div \frac{7}{10} - \frac{1}{8}$
$5.6 \times 7.8 + 5.6 \times 1.2 + 5.6$
$450 \times (\frac{2}{3} + \frac{7}{15} - \frac{3}{5})$
$\frac{4}{5} \div 3 + \frac{2}{3} \times \frac{4}{5}$
$36.4 - (8.4 + 3.75 \div 0.375)$
$(27.6 - 0.9) \div (2.5 \times 4)$
$2 \div (\frac{1}{10} + \frac{1}{12} + \frac{1}{15})$
$0.04 \times [20.4 \div (4.3 + 0.8)]$
$\frac{1}{14} \times \frac{7}{11} + \frac{4}{11} \div 14$
$\frac{3}{8} \div [(\frac{1}{3} - 25\%) \times 24]$
$(\frac{7}{8} - \frac{5}{16}) \times (\frac{5}{9} + \frac{2}{3}) - \frac{3}{8}$
$65\% \times \frac{1}{9} + 35\% \div 9$
$0.89 \times 100.1 - 0.089$
$80\% \div [(\frac{5}{8} - \frac{1}{2}) \div \frac{5}{6}]$