We can use the tangent-secant theorem to solve this
We have that
y^2 = 7 ( 7 + 15)
y^2 = 7 (22)
y^2 = 154
And applying this once more, we have that
y^2 = 5 ( 5 + x)
154 = 25 + 5x subtract 25 from both sides
129 = 5x divideboth sides by 5
129/5 = x = 25.8
