$\left(2x+3\right)^2-\left(x+4\right)^2-3\left(x+1\right)$
$5x+20$
$5^{-\frac{x}{10}}=5$
$\left(x^2-7\right)\ge2x^2+8$
$\int1+\frac{2}{y}dy$
$\left(2x^2+3xy^2\right)^2$
$20x^4-72x^2+36$
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