$\left(5a+b\right)\left(5a-b\right)$
$x^2-3x-30$
$3x^4+5x^3-12x^2-20x$
$ln\left(19x\right)-ln\:19$
$10\left(3+8k\right)+9\left(k+3\right)$
$\frac{x^3-125}{x^3-15x^{2\:}+75x-125}$
$2-x<2x$
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