$0.8+1.2$
$\cos\left(x\right)-1=\cos\left(2\right)x$
$x-\frac{ax-ay+z}{1+2a^2}$
$f\left(x\right)=\left(x+7\right)^3\left(5x-6\right)^4$
$18=\frac{-3x+27}{13}$
$7k-k+19$
$\frac{10x^3+11x^2-6x}{5x-2}$
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