$-\left|-12\right|+\left|-13\right|$
$h\left(x\right)=x^5+2x^3-8x^{-1}+10x^{-4}-6$
$2b+2\left(8-3b\right)$
$\frac{1-cos^2x+sin2x-sin^2x}{1+cos2x}=\tan\left(x\right)$
$\frac{1}{2}x-\frac{1}{2}x$
$4\left(x+10\right)-2\left(x+22\right)$
$3x^2+4x=300$
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