The equations x + 1 = 0 and 2x + 2 = 0 have the same solution.
If m is a whole number, then 2m denotes a multiple of 2.
If x is a negative integer, –x is a positive integer.
In the equation 7k – 7 = 7, the variable is 7.
a = 3 is a solution of the equation 2a – 1 = 5
The distance between New Delhi and Bhopal is not a variable.
x = 5 is the solution of the equation 3x + 2 = 20
‘One third of a number added to itself gives 8’, can be expressed as x/3 + 8 = x
The difference between the ages of two sisters Leela and Yamini is a variable.
The number of lines that can be drawn through a point is a variable.