Isolate the variable c: Isolate the variable c on one side of the equation.To do this, we need to subtract 81 from both sides of the equation.81+c−81=54−81c=54−81
Find a common denominator: Find a common denominator for the fractions to subtract them.The common denominator for 5 and 8 is 40.c=(54)⋅(88)−(81)⋅(55)c=(4032)−(405)
Subtract the fractions: Subtract the fractions.Now that we have a common denominator, we can subtract the numerators.c = 4032 - 405c = 4032−5c = 4027
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