$\left(3x^4-3x^2+x-5\right)\left(x^2+3\right)$
$81y^2-25$
$7x^2+2x-3-5x+2$
$x^2-4x+1^2$
$3+4x\le8x+6$
$\frac{26x^2}{9}+\frac{16xy}{15}+\frac{4y^2}{25}$
$1776.241633-8\cdot\frac{14\sqrt{7}-10\sqrt{5}}{3}$
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