$2^4\cdot9^{11}$
$50c^2\:+\:120cd\:+\:72d^2$
$28x-6x^2+4y=0$
$8\:x\:2+4$
$\frac{2x-7}{4x+8}-3\le0$
$64x^3+1$
$x-19=-14$
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