aider moi [tex] \frac{70}{105}-3 [/tex]

[tex] \frac{70}{105} - 3 = \frac{70}{105} - \frac{3}{1} = \frac{70}{105} - \frac{315}{105} = \frac{70-315}{105} = \frac{-245}{105} = -\frac{245}{105} = -\frac{7}{3} [/tex]