An equation consists of 2 expressions that are equal.
A linear equation is an equation consisting of one variable (usually x) to the first power and is of the form: ax + b = 0 or ax = b (where a and b are real numbers)
To isolate the variable, you cancel a term on one side of the equation by using the inverse operation to 'undo' the given operation.
For example, to solve the linear equation: 3x + 7 = 10
Subtract 7 from each side (to undo the addition symbol in front of 7)
Then divide by 3 to each side (to undo the 3 being multiplied to the x)