$\left(a^2-2a+1\right)\left(3a^2-3a+4\right)$
$5\left(2y-7\right)=15$
$9-5.67$
$a^2+7a-60$
$\left(r^4-4r^3+7\right)\left(-3r^4-5r^3\right)$
$\lim_{x\to0}\left(\frac{3x^3}{sin\left(x\right)-x}\right)$
$671,8-53,4$
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