$18x^2+7x^2$
$4\left(1+a\right)^2-4\left(1+a\right)+1$
$\frac{3}{5}x^6:\frac{2}{4}x$
$13-6\cdot\left(-2\right)$
$f\left(x\right)=3x^2+13x^2+2x-8$
$\frac{d}{dy}\left(x^2+xy+y^3=1\right)$
$\left(81\right)\cdot\left(-35\right)\cdot\left(-2\right)$
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