$\lim_{x\to0}\:1$
$7w+5-3w-15+2z$
$e3.2188$
$4a^2\cdot a$
$\left(-4\right).\left(-1\right)$
$\left(-xy\right)-1$
$\int\frac{2-e^x+x^2}{3x}dx$
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