$e^x\left(2x+1\right)^3$
$2x+5x^2=0$
$\frac{9-\left(m+n\right)^2}{3+\left(m+n\right)^2}$
$x^2+4x+x^2+4x=28$
$a^2-b^2;\:a=-1;\:b=2$
$\left(7y+9\right)\left(7y-9y\right)$
$\log\left(3^y\right)-\log\left(4^{x+2}\right)=0$
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