$4x\le12$
$6x^2y^2\:+\:3x^2y\:+7xy^2\:+\:4x^2\:+\:8xy$
$2\sin^2\left(\frac{x}{4}\right)$
$12d-6\left(-11d+18\right)$
$\sqrt[3]{9x^4y\:}.\sqrt[3]{3x^4y^4}$
$4\left(2x+8\right)-3x$
$6+9s-5$
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