Hi Akil
Solve karte hue
z/4 = (z + 15)/9
yahan pe 9 left side multiply ho jaega, aur 4 right side multiply ho jaega
9z = 4(z + 15)
9z = 4z + 4 × 15
9z = 4z + 60
9z - 4z = 60
5z = 60
z = 60/5
z = 12
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