$\left(x+y\right)dx+\left(y^3+x\right)dy=0$
$8\tan\left(-x\right)\cos\left(x\right)$
$2x-3+2x+3$
$\frac{x^3+x^2-x-3}{x^2-3}$
$3\cdot5c$
$x-3<3-x$
$7+1-\left(-8\right)$
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