$4x-5y=20$
$\frac{m^4n^4-81v^6}{m^2n^2+9v^3}$
$\int\sin^4\left(\frac{x}{3}\right)cos^4\left(\frac{x}{3}\right)dx$
$5p+9<2p+6$
$\left(y^3-7\right)\left(-8+y^3\right)$
$\left(\frac{1}{a+2b+3c}\right)^2$
$20-6.24$
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