Class 7 · Chapter 15
Finding the Unknown
Solving simple linear equations.
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Ganita Prakash · Class 7 Part 2 (2026-27)
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Detailed theory
Whatever you do to one side, do to the other. Adding, subtracting, multiplying, or dividing both sides preserves the equation.
Key concepts & formulas
01
An **equation** balances two expressions with .
02
Solve by isolating the variable.
03
Do the same operation to both sides (golden rule).
04
Check by substituting the solution back.
05
solved by transposing: .