$- x - 20 - 30 + 40$
$-7>3-t$
$f\left(x\right)=\left(-2^{-2}-5\right)\left(3x^{-3}+9\right)$
$\left(y^3+y\right)\frac{dy}{dx}=1$
$y^2+2\left(yz\right)+z^2$
$6n+15n^2$
$7x\:+\:7y\:-\:7x\:+\:8y\:+12$
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