$5x^2-10x+1$
$-x^2-19x+84$
$3\left(5-2x\right)+5\le7-2\left(x+1\right)$
$-4\cdot\left(-14\right)$
$\frac{7^{-2}.3^5.2^7}{4^3.9^2.7^{-3}}$
$\left(x-\frac{3}{4}\right)\left(x+\frac{1}{2}\right)$
$\csc^2x+2\csc x$
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