What is the original number?

When 55 is added to a certain number, and the sum is divided by 3, the result is 4 times the original
number.  What is the original number?

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x = the number

x + 55
------ = 4x  {55 is added to a number, the sum is divided by 3, the result is 4 times the number}
3

x + 55 = 12x  {multiplied each side by 3}
55 = 11x  {subtracted x from each side}
x = 5  {divided each side by 11}

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