$e^{x^2}dy=-xy^3dx$
$\left(6x^2-x+7\right)\:-\:\left(9+x\right)$
$x^2+4=6x$
$x-2\ge2x+3$
$2x^2\:+\:2x\:+\:xy\:=\:5\:$
$cos^2\left(4x\right)-sin^2\left(4\right)$
$1+2-3x^2-3x^2^2+3x^2^2+3-4$
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