$\left(\frac{-9\:^3\sqrt{x^2}}{\sqrt{x}}\right)^2$
$\frac{x^3+3x^2+2}{x^4+1}$
$4x^6-4x^2$
$2x-5=-x+19$
$a\cdot e^x+b.e^{\left(-x\right)}=y$
$5\sin\left(x\right)-3=0$
$\left(3x-5y+20x\right)^2$
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