$cscx-tan\frac{x}{2}=-cotx$
$191.6-123.99$
$x^2-2x+37$
$\frac{x+1}{2}+\frac{x+2}{3}+\frac{x+3}{4}=3$
$-6a+b^2-2a-3b^2$
$4x^2+2x^2+1$
$3\left(x-4\right)=-9$
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