$-9x+8-7x^2-6x^2-x+6$
$-1030-1600$
$\sin b\left(\csc b-\sin b\right)=\cos^2b$
$-3\left[6+2\left(5-7\right)^3\right]$
$\frac{5}{x}>1$
$x^3-13+12$
$30-2^2-1^3\cdot3$
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