$2ab+5a-3ab-4a+b$
$0=e^{2x-y}\cdot dx+e^{y-2x}\cdot dy$
$8x+3x-7x-x$
$\frac{9^6}{9^4}$
$33-2x=31$
$2\sin^2u-\sin u-1=0$
$\left(2xy\right)dx+\left(y\right)dy$
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