Step-by-step explanation:
[tex] \frac{3}{10} - \frac{12}{18} + \frac{2}{6} \\ \\ = \frac{3 \times 9}{10 \times 9} - \frac{12 \times 5}{18 \times 5} + \frac{2 \times 15}{6 \times 15} \\ \\ = \frac{27}{90} - \frac{60}{90} + \frac{30}{90} \\ \\ = \frac{27 - 60 + 30}{90} \\ \\ = \frac{57 - 60}{90} \\ \\ = - \frac{3}{90} \\ \\ = - \frac{1}{30} \\ [/tex]
