$12c+14c-18$
$12.25\cdot0.49$
$-\left(12+\left(-3\right)\right)-\left(-4\right)-5+6-\left(-4\right)$
$-4x+10<2x-1$
$\lim_{x\to2}\left(\frac{x+2}{x^2}\right)$
$\frac{x^2-5}{x-1}$
$\frac{x^{12}-81}{x^3+3}$
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