$2\log_{5}\left(x+9\right)=\log_{5}25+2$
$y'\:+\:2y\:=\:y^2\:+\:1$
$\left(y-3z\right)^2$
$12\:-\:\left(\:-\:9\:+\:20\:\right)\:-\:4$
$6xy+7-4xy$
$\lim_{x\to\infty}\left(x^2\left(\sqrt[x]{a}-\sqrt[x+1]{a}\right)\right)$
$\left(0.4a^{x+2}+0.2a^x\right)^2$
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