5.2.4.26 Various Problems on the Plane

Dan triangle csj. On the continuation of the party \ (j c \) for the point \ (j \) the point \ (q \) is selected. Some straight line passing through \ (q \) crosses the segment \ (c s \) at the point \ (z \) and the segment \ (j c \) at the point \ (h \). What is the area of the triangle \ (z j s \) if \ (j: j Q = 3: 4 \), the area of the triangle \ (C H Q \) is 28, and the area of the triangle \ (C H Z \) is 10.5?