$9x^7y^5-6x^4y^3$
$4y^3-8y^2-12y$
$cosa+1=4cosa+1$
$\:\left(3mx\right)^2$
$\frac{x}{4}+1=4$
$a^2+a-1$
$\frac{2x^7}{2x^5}$
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