$7x+3x+2y+4$
$\left(4m+6n\right)^2$
$-27-54$
$\int\cot9xdx$
$\frac{dy}{dx}=2x+\frac{y}{x}$
$6x^5+30x^5$
$1-2\left(3x\right)^{2}\left(5\right)$
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