$\:89mn\:+\:28\:zx\:+\:200zx\:-\:90yk\:+\:70mn-\:25zx+\:45mn\:-\:30yk$
$196m^6-196n^{12}$
$\frac{15x^{-3}z^5}{3x^7z^{-5}}$
$-3\cos-\sqrt{3}=0$
$2\left(w-6\right)-4w$
$7.08+2.45+15.220$
$54^2-46^2$
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