$42:\left(-6\right)+5\cdot\left(3-15\right)-\left(-9\right)\cdot4+8$
$cos2x\:+5cosx\:\:+3$
$\left(3y^{-1}\right)^3$
$x^2+x=3x$
$5xb+5by-3ax-3ay$
$\frac{x^3+7x^2+4}{x+7}$
$\left|-5\right|-\left|2\right|$
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