Area Under The Curves

Let for \(x \in \mathbb{R}\),

$$ f(x)=\frac{x+|x|}{2} \text { and } g(x)=\left\{\begin{array}{cc} x, & x<0 \\ x^{2}, & x \geq 0 \end{array}\right. \text {. } $$

Then area bounded by the curve \(y=(f \circ g)(x)\) and the lines \(y=0,2 y-x=15\) is equal to __________.