Practice30Create account

Which of these has the same solution as ?

Class 7Simple EquationsSimple Equations
  • A
  • B
  • C
  • D

Step-by-Step Solution

Add 7 to BOTH sides: → , which still has the solution (and ✓). '' subtracts 7 instead of adding it; '' adds 7 only on the left, so the balance tips and it means ; the last option divides only the by 4 and leaves the −7 and the 13 alone.
Answer: C)

Key idea: Transposition — the shortcut

When you're comfortable with the balance method, you can move terms across the '=' sign in one step by **flipping the sign** of the term that moves.


→ move +2 across, flipping it to −2:
→

For the multiplier: move ×3 across as ÷3 (and ÷ moves across as ×). Same balance idea, faster notation. **The sign flips because addition and subtraction are inverses, multiplication and division are inverses.**

Master this chapter in 30 minutes a day.

Don't just memorise the answer — build a daily practice habit.

Practice 5 Similar Questions Free →

All Simple Equations practice questions

More Class 7 Simple Equations practice

A library bought 45 more books and later lent out 78 of them; 267 books now remain on…A school library has 4 times as many Hindi books as Marathi books, and 120 more Hindi…Three of these equations are satisfied by x = 3. Which one is NOT?The equation 7 = 2x − 5 is rewritten as 2x − 5 = 7. What effect does swapping the two…Deepa thinks of a number, multiplies it by 6, subtracts 9 from the product and gets 45.…