-6 2/5 - 4 1/3

$$-6 \frac{2}{5} - 4 \frac{1}{3} \\\\
=-(6 \frac{2}{5} + 4 \frac{1}{3}) \\\\
=-(6+ \frac{2}{5} + 4+\frac{1}{3}) \\\\
=-(6+4+ \frac{2}{5}+\frac{1}{3}) \\\\
=-(10+ \frac{2*3}{5*3}+\frac{1*5}{3*5}) \\\\
=-(10+ \frac{6}{15}+\frac{5}{15}) \\\\
=-(10 \frac{11}{15}) \\\\
=-10 \frac{11}{15} \\\\$$

OR use a calculator

http://web2.0calc.com/questions/how-do-i-type-in-fractions