$-10x^2+490=x$
$5a^2b^2-35a^2b^2+55abc$
$\tancq=1.5$
$\left(z+4\left(z-4\right)\right)$
$x-3x^2+1\cdot x+3$
$\lim_{x\to\infty}\left(\frac{2x^4}{n-1}\right)$
$4m-2n+6n+m-5n$
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