\(x-\left(25\%\right)^2.x=\dfrac{1}{2}-\dfrac{7}{4}\\ \Rightarrow x-\left(\dfrac{1}{4}\right)^2.x=\dfrac{2}{4}-\dfrac{7}{4}\\ \Rightarrow x-\dfrac{1}{16}.x=-\dfrac{5}{4}\)
\(\Rightarrow\dfrac{15}{16}x=-\dfrac{5}{4}\\ \Rightarrow x=-\dfrac{5}{4}:\dfrac{15}{16}\\ \Rightarrow x=-\dfrac{4}{3}\)