$5a-3b+7c+-3a+5c+5b$
$\log\left(5\right)\sqrt{x^2}+49=2$
$0.02\cdot100$
$50\::\:\left(-5\right)+\left(-4\right)$
$\lim_{x\to\infty}\left(\frac{x^3+4x^2+4x}{x^2+4x}\right)$
$-2x^2+250x$
$\left(4m^2-7n^4\right)\left(4m^2+7n^4\right)$
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