$2x^2+3xy$
$-2x+3y=14$
$10\:cm\:b\:20cm\:\sqrt{300}$
$9n^6-18n^3+n^6$
$\frac{x^2+3x-4}{x^2-2x+8}$
$3x^2+18x+34=4$
$-70\left(15-15\right)-450\left(15-5\right)+336,67\cdot15$
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