$x^2-5x+2,24$
$-15+\left(-7\right)-\:2-\left(-4\right)+\left(+3\right)-\left(+8\right)-7$
$\frac{8x^310x^2+5x-1}{2x+1}$
$\sin\left(4x\right)-sin\left(2x\right)=sin\left(x\right)$
$3\cdot10$
$4d^2+20-25$
$\:\lim_{x\to9}\left(\frac{3x-27}{\sqrt{x}-3}\right)$
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