$-3x^2+7x+8$
$\frac{1+i}{1-i}$
$+\left(-1\right)-\left(-2\right)$
$x+\left(\frac{1}{1-x^3}\right)$
$\sqrt{12}-3\sqrt{27}$
$-66+-49$
$\log_x\left(\frac{2-logx}{logx}\right)$
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