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SAI International School

Grade-VII

Mathematics

CHAPTER-4: Simple Equations,

LESSON NOTE-2

SUBTOPICS: Solving an equation, Different methods of solving an
equation, Solution of an equation

Balanced Equation:

When the LHS = RHS of an equation, then it is said to be a balanced equation.

1. If we add the same number to both the sides.

We can add the same number on both the sides of a balanced equation; the equation
will remain the same.

12x = 3

If we add 3 to both the sides,

12x+3 = 3 +3

12x+3 = 6

LHS = RHS

2. If we subtract the same number from both sides.

We can subtract the same number from both the sides of a balanced equation, the
equation will remain the same.

12 – 8 = 4

If we subtract 3 from both the sides,

12 – 8-3 = 4-3