8*c=m
m*3=a
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8C3 = 8*7*6/(3*2*1) = 56
If they are present in the expression you need to use them to evaluate the expression, if they are not, you don't. You would not use any of them - at least not explicitly - to evaluate sqrt[ln(pi)], for example.
There is nothing to "evaluate" there; that's a pure number.
It should be evaluated as a major calculation error!
The answer is x = 5. There is nothing to evaluate there!