The \(x\)-intercept of a plane \(\pi\) passing through the point \((1,1,1)\) is \(\dfrac{5}{2}\) and the perpendicular distance from the origin to the plane \(\pi\) is \(\dfrac{5}{7}\). If the \(y\)-intercept of the plane \(\pi\) is negative and the \(z\)-intercept is positive, then its \(y\)-intercept is