step-by-step
a=1, b=Divide\left[1,3\right]a+Divide\left[1,3\right]c+Divide\left[1,3\right]e, c=Divide\left[1,2\right]b+Divide\left[1,2\right]d, d=Divide\left[1,3\right]c+Divide\left[1,3\right]e, e=Divide\left[1,4\right]b+Divide\left[1,4\right]d+Divide\left[1,4\right]f+Divide\left[1,4\right]g, f=Divide\left[1,2\right]a+Divide\left[1,2\right]e, g=Divide\left[1,2\right]e, find e
it