Write Equation: Write down the equation.31+a=45We need to isolate ′a′ on one side of the equation.
Isolate 'a': Subtract (31) from both sides to isolate 'a'.a=(45)−(31)
Subtract Fractions: Find a common denominator for the fractions to subtract them.The common denominator for 4 and 3 is 12.a=4×35×3−3×41×4a=1215−124
Simplify: Subtract the fractions.a = (1215)−(124)a = (1215−4)a = 1211
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