$x^2+y^2+z^2-x+y=0$
$2\tan-\sec^2$
$y^2-5y=-6$
$-5+t=-15$
$\left(x^2z\right)\left(3x^2y^3+z^4\right)$
$x^2y'\:+\:xy\:=\:3$
$19+16+2$
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