$y=-2\left(x+3\right)$
$x^2y^2-100$
$2\cot-3=5$
$\:y'\:+\:y^2\:-\:y\:=\:0$
$x^2+y^2+z^2=49$
$3-7a+4a^2$
$\int2\left(x+1\right)dx$
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