$4x^3+5y^2\:4x^3-5y^2$
$3y-\left(2y-6\right)=25$
$1-k^{20}$
$\lim_{x\to\infty}\frac{\ln\left(3x\right)}{e^{7x}}$
$n^2+12n+36$
$\frac{x^4+3}{x^2}$
$-2xh-h^2$
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