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We have the following:

solving for x

The solution of x is equal to 28, therefore 12 is not a solution of the equation
So column A needs to all be the same multiples of 4 so 4•3 is 12 and so other multiples need to be placed
A+b+c = 131
b = 7 + 2a and c = a - 12
so a + 7+2a + a-12 = 131
then 4a -5 = 131
then 4a = 136
and a = 34....so b= 75 and c = 22....check 34+75+22=131√
( 2a2 - 2b - 1 ) Is the answer when simplifying the expression.