x-1/12 + x-1/20 + x-1/30 + x-1/42 = (4/3)^ 2

\(x\ -\ \frac{1}{2}+\ x-\ \frac{1}{20}+x-\frac{1}{30}+x-\frac{1}{42}=\left(\frac{4}{4}\right)^2\)