Impossible, since a = (19)(18a) a must equal 0 and in your original equation you have ((75)(71))/11a meaning you divide by (11)(0) which equals 0. You are trying to divide by 0, fatal mistake.
if you try to refute this by saying that a is not 0, then the statement a=(19)(18a) is untrue since by doing a bit of algebra we can see that 1=(19)(18)=342 and since 1 does not equal 342 it is false.