$\frac{1}{2}\left(b+c\right)d$
$3\cdot4-2+3\cdot2-5+4-9$
$6x-4y+4z=28$
$36a^2-b^4$
$3^x^{+1}-3^x$
$\:5x\:x\:2x$
$\lim\:_{x\to\:\:\:a}\left(\frac{\sqrt[3]{x}-\sqrt[3]{a}}{x-a}\right)$
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