From the point \( (-1,-1) \), two rays are sent making along of \( 45^\circ \) with line \( x+y=0 \). These rays get reflected from the mirror \( x+2y=1 \). If the equations of the reflected rays are \( ax+by=9 \) and \( cx+dy=7 \), \( a,b,c,d\in \mathbb{Z} \), then the value of \( ad+bc \) is ______________ .
