$5a^2+b^2;\:a=2;\:b=3$
$-x^2-3x-18=0$
$xy-4y=x^5g^x$
$\left(x^3-2x^2+x-2\right)x-2$
$\left(\sqrt{5+2}\sqrt{6}\right)^{-1}$
$x+7=2x-5$
$2+3x<x-4$
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