$3\left(x+y\right)-a\left(x+y\right)$
$\left(-\frac{5}{12}\right)\left(\frac{36}{25}\right)\left(\frac{3}{4}\right)\left(-\frac{20}{3}\right)$
$3x^2-3x<\:2x^2+4$
$x^2+6x+40$
$\left(\frac{4xy}{y^3}\right)^{-3}$
$14cos^2x+9cosx+1=0$
$\frac{54-6}{6}-2$
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