Tìm x biết: a) \(\frac{3}{5}x - \frac{1}{2} = \frac{1}{7}\) b) (4,5-2⁢x).117=1114 c) \[80\% + \frac{7}{6}:x = \frac{1}{6}\] d) \(\frac{3}{4} - \left( {4\frac{1}{2} + 3x} \right) = - 1\)