$160<10x$
$25m^2-20m+4$
$\left(5x^2+9x\right)+3x$
$2\cos\left(2x\right)\cos\left(x\right)-\cos\left(3x\right)$
$7x=175$
$2ab+2ac2+ab3$
$\frac{x^3-3x^2-9x-18}{x^2-9}$
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