$3x+2\left(x-1\right)-5$
$7a^2+17a+6$
$\lim_{x\to\infty}\left(\frac{5^x-1}{5^n}\right)$
$\left(2x^4+y^3\right)^2$
$x-x^2+1=4$
$y^{2}-y^{2}+4y-4$
$z=4x-5y^2$
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