$\left(e^{x+y}\right)dx=\left(e^{2x-3y}\right)dy$
$\left(3a^3-x^2\right)^2$
$a^2-169$
$x^2+8x=20$
$lnx+ln\left(3x\right)=1$
$\int e ^ { 7 x ^ { 3 } } x ^ { 2 } d x$
$5x-1\ge2x+3$
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