Find x

When we add 55 to a number x and divide the total by 4 the result is three times the original number. Find x.

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x + 55
------ = 3x   {add 55 to a number x, and divide the total by 4, the result is three times the number x}
    4

x + 55 = 12x  ​{multiplied each side by 4}

11x = 55   {subtracted x from each side}

 x = 5   {divided each side by 11}

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