$\frac{4+2x}{2}=5$

$2x^2+8x-12$

$\log_{30}\left(c-1\right)+\log_{30}\left(c-8\right)=1$

$\frac{\left(x^2-\:2x\right)}{3}$

$\frac{3a^2b^2c^2-2abc+ab^2c}{abc}$

$sin\left(x\right)+sin\left(x\right)cos\left(x\right)+cos\left(x\right)=1$

$\log\left(\frac{1}{3}\right)x=3$