$-18.1\:+\:29.7$
$169x^2-52xy+4y^2$
$3\left(x+3\right)-6$
$4+\ln\left(x-5\right)=2$
$-4\left(1+5n\right)+9$
$\left(\frac{\sqrt{64a^{12}}}{\left(a^{1.5}\right)^{-6}}\right)^{\frac{2}{3}}$
$3ax^2-3a$
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