$-97\cdot3$
$\frac{1}{3}x+\frac{1}{2}y-\frac{3}{4}+3y-\frac{1}{4}x+\frac{1}{6}y+\frac{1}{2}$
$\left(x+3x\right)+\left(x-3x\right)$
$12.4+12.4$
$x^4-x^2y^2+\frac{y}{4}^4$
$4^5.4^3$
$\lim_{x\to1}\left(\frac{-1+x}{x-1}\right)$
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