$-\left(-27\right)$
$x^5-x^4-27x^3+13x^2+134x-120$
$\left(\:4x+2y\right)^2$
$\left(8y+9a\right)^2$
$1-a^2=\left(1-a\right)\left(1+a\right)$
$\frac{2x^2.}{x^2+9}$
$3\log\left(x^{11}\right)-3\log\left(x^3\right)$
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