$\frac{-x}{2}+1<\frac{1}{2}$
$3\cdot5+3-2\cdot7+1$
$-24.37+5.10$
$12+12+1$
$3x+2x-x+2x^2$
$a^6-\:3a^4+\:8a^3-4a^2$
$4x^2\cdot\left(6x^3+3x^2\right)$
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