$\left(14a^2-6cd\right)\left(7a^2+3cd\right)$
$3\sqrt{-75}$
$6x^2=6$
$3x^2-5x-3$
$2x-x\left(-5x^2-8x-10\right)+5x$
$7x-8-12x+4$
$\frac{1}{5}-\frac{1}{5}\cdot5+\frac{1}{5}-3^{2}-\left(\frac{1}{5}-1+\frac{1}{5}-9\right)$
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