This poem was written by John Saxon (an author of maths textbooks).

((12 + 144 + 20 + (3 * 4^(1/2))) / 7) + (5 * 11) = 9^2 + 0

Or for those of us who have trouble with reading the poem:

A Dozen, a Gross and a Score,
plus three times the square root of four,
divided by seven, plus five times eleven,
equals nine squared and not a bit more.