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1. A statement of equality between two algebraic expressions, involving one or more variables is called an equation.
2. If the highest power of the variable (s) in an equation is 1, it is said to be a linear equation. 

3. Any operation done on one side of an equation must be done on the other side also, for the equation to remain true.
Transpose method : 

  • A term in an equation can be transposed from one side of an equation to the other by changing its sign. 
  • A number that divides a variable or a constant on one side, when transposed, multiplies on the other side and vice versa. 
  • 4. While solving word problem, do the following steps:
    (i) Identify the unknowns

    (ii) List out the given data

    (iii) Form the equation using given relation

    (iv) Find the unknown using solving equation

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