$-4x\:+\:12\:=\:2x\:+\:18$
$4-4\cdot7+3$
$-2^7$
$18\cdot22$
$ln\left(x+9\right)=2ln\left(x-1\right)$
$\lim_{x\to0}\left(\frac{tan\left(9x\right)}{ln\left(1+x\right)}\right)$
$4\left(9x-4\right)$
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