Turn a word problem into an equation

Three notebooks and a pen cost ₹65. The pen costs ₹5. If each notebook has the same price x, write 3x + 5 = 65.

Subtract 5: 3x = 60. Divide by 3: x = 20. Each notebook costs ₹20. Check: three notebooks cost ₹60; adding the ₹5 pen gives ₹65.

Practice: four identical pencils and a ₹6 eraser cost ₹30. Write 4x + 6 = 30, giving x = 6. Each pencil costs ₹6.