$x^2y'+xy=x$
$-20ab+11ab$
$e^{x-1}-2=0$
$8x-5x+4x-12x$
$y^2+3y^2-6y+4y^2$
$\sin^4\left(a\right)+\cos^2\left(a\right)-\sin^2\left(a\right)$
$2\left(x+3\right)\ge4\left(x-1\right)$
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