$\left(4x^4+3x^3-2x^2+x-9\right)+\left(6x-18+2x^4\right)$
$7m\ge21$
$1^2-3^2+0^2$
$\left(x+3\right)\left(x+5\right)-\left(x-2\right)\left(x-7\right)\:$
$-89\cdot\left|45-44\right|$
$f\left(x\right)=2x^4-\frac{3}{x^6}-\sqrt{x^3+10}$
$\frac{1}{t}=\frac{v'}{-nv}$
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