$2k^2+k-7=0$
$a^2+b\:^2=33$
$\int-\frac{6}{x^5}dx$
$\int\frac{2}{x^2+25}dx$
$+8zy2+1zy2$
$\left(\frac{5}{7}x^3y^2+x^2y^3\right)^2$
$6x+24y$
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