$4a^2+12a^2$
$2x-3x-3+4x^2+10+x$
$\left(5x^4-6x-3\right)+\left(-3x^4+x^3+5x^2-7x+3\right)$
$x^2-8x=-9$
$\log_{\sqrt{a}}\left(x-6\right)-\log_{\sqrt{a}}\left(2\right)=\log_a\left(x\right)+\:\log_a\left(2\right)$
$\left(y+2\right)x^2$
$\frac{a^2}{9}-\frac{1}{4}a^2b^2$
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