$8-4\cdot4$
$\sqrt{a^2}\cdot b^4\cdot\sqrt{a^4}\cdot b$
$x+\:\frac{4}{x}=-2$
$\left(7x^{2}y^{3}+5z^{2}\right)^{2}$
$10x^2-7x-12$
$y^2+4y+3$
$m=11.18,n=10.25,p=15.16u$
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