$30^2-15^2+c$
$3\left(\frac{4\sqrt{3}}{2\sqrt{3}}\right)x\:\:\left(\frac{4\sqrt{3}}{\sqrt{\left(4\sqrt{3}\right)^2-\left(2\sqrt{3}\right)^2}}\right)^2$
$3-8\cdot8+10$
$-2x^2+4=-2x$
$8\cdot9+9-7$
$12-\frac{1}{3}u=2$
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