Question 1169353
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<pre>

    x-1 = {{{(3/4)*(x+12)}}}


Multiply both sides by 4 and then simplify


    4x - 4  = 3x + 36

    4x - 3x = 36 + 4

       x    = 40.


<U>ANSWER</U>.  Carl is 40 years old.
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Solved.