$y^2-2y+15$
$\left(x^2.y^5z\right)^5$
$\left(x^3-\frac{2}{4}^4\right)$
$\left(n^2-1\right)\left(n^2+20\right)$
$\frac{5}{4}x-\frac{5}{3}x$
$5120.50-3472.60$
$\left(3x^4\right)\left(5x^7\right)^2$
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