$\frac{3}{4}-\frac{9}{2}=\frac{3}{4}$
$-2g-\left(-5\right)+1$
$4:\left(x-2\right)=2\:\left(x+10\right)$
$\left(-12\right)+14+\left(-8\right)-\left(-20\right)$
$2.1\cdot8.2$
$-7\sqrt{7}-3\sqrt{7}$
$\lim_{x\to-7}x^2+9x+2$
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