3)-=//=/36

Решение:

• Умножим обе части уравнения на -\(\frac{9}{7}\):

\[-\frac{7}{9}x = \frac{35}{36}\] \[x = \frac{35}{36} \cdot (-\frac{9}{7})\] \[x = -\frac{35 \cdot 9}{36 \cdot 7}\] \[x = -\frac{5 \cdot 1}{4 \cdot 1}\] \[x = -\frac{5}{4}\] \[x = -1\frac{1}{4}\]