$-x^2-5x+14$
$3x^2y-7x^2$
$\frac{1}{2}\cos\left(3x\right)$
$406x-5.0x^2+6$
$5-\left\{3-\left[2-\left(2\cdot\left(-3\right)+1\right)+\left(3-.5\right)\right]\right\}$
$2x^2-18x+16=4x^2-30x+26$
$\left(4x-2y+5z\right)^2$
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