12m2n + −13m2n\frac{1}{2}m^2n\:+\:\frac{-1}{3}m^2n21m2n+3−1m2n
a2+6a+9=0a^2+6a+9=0a2+6a+9=0
4x−4x24x-4x^24x−4x2
25ax2−9a25ax2-9a25ax2−9a
7⋅43+8⋅42+−8⋅4+−17\cdot4^3+8\cdot4^2+-8\cdot4+-17⋅43+8⋅42+−8⋅4+−1
−9(−u3−1+4w2)-9\left(-u^3-1+4w^2\right)−9(−u3−1+4w2)
(−8)(9)(−2)\left(-8\right)\left(9\right)\left(-2\right)(−8)(9)(−2)
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