$25x^2-625=0$
$\frac{\cos\left(x\right)}{\sec\left(x\right)}+\frac{\sin\left(x\right)\cos\left(x\right)}{\cot\left(x\right)}$
$xy+3y=x^2$
$7a^2b-5ab$
$\lim_{x\to\infty}\left(8xe^{-x}\right)$
$f\left(x\right)=\:\frac{9}{k}+8$
$3x>217$
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