$\ln x=-2$
$\left(-4\cdot x+2\right)^2$
$8x^4+20x^3-12x^2$
$-5=u-2$
$4m^2-81n^2$
$3^{a+b}\cdot3^{a+c}$
$3\left(x^{2}-2y^{2}+y^{2}\right)-4\left(x^{2}-y^{2}-3yz\right)+x^{2}+y$
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