byjus.com › maths › linear-equation-in-one-variableLinear Equations in One Variable - Definition, Solution and ... Thus, the formula of linear equation in one variable is ax + b = 0. Solving Linear Equations in One Variable. For solving an equation having only one variable, the following steps are followed. Step 1: Using LCM, clear the fractions if any. Step 2: Simplify both sides of the equation. Step 3: Isolate the variable. Step 4: Verify your answer.