$7\left(1-9a\right)-5\left(4a+7\right)$
$2x+1=u$
$2a^2bc^2-5a^2bc^2+3a^2bc^2-a^2bc^2=0$
$\frac{6y^3z}{2yz^2}$
$\lim_{x\to\infty}\left(2+\frac{9}{a}\right)$
$4\left(5b\right)$
$24a^2-144b^2$
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