$3\cdot4+5\cdot6$
$x^2-2+2$
$450\:-\:\left(-70\right)$
$400x^{10}+40x^5+2$
$30u^4w^3x^5+18u^9w^6$
$\frac{5}{6}xy-\frac{7}{12}xy+\frac{1}{3}xy$
$u=x^2+y^2$
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