$\left(+2\right)\cdot\left(-7\right)-8\cdot\left(-4\right)-\left(-5\right)\cdot\left(-2\right)$
$\lim_{x\to-2}\left(-3\right)$
$7-4a-7+5a$
$b^2-\frac{b}{2}$
$5a-6b+8c+9a-20c-20c-b+6b-c$
$4a^3b^3+6a^2b^3$
$x-2<1$
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