$4z+3z+9z$
$8+2\left(-4\right)-6\left(7-8\right)$
$\lim_{x\to-\infty}\frac{x^2+\sqrt{x^4+3}}{3x^2+7}$
$\sin\left(4y\right)\frac{dy}{dt}=cos\left(3t\right)$
$-\frac{3x+2}{3}$
$a^2-18a+16$
$\left(2x+\frac{2}{3}\right)\cdot\left(2x-\frac{2}{3}\right)$
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