$\frac{dx}{dt}=t-\frac{1}{5}x$

$\left(\frac{2x^{2\:}y}{3x^4}\right)^3$

$\int\frac{10}{x\cdot\sqrt{81x^2-49}}$

$6.4+6.3+6.4+6.7+6.8+6.8+6.9+6.9+6.9+6.9+6.9+7.0+7.3+7.5+7.8+7.8+7.8+7.9+7.9+8.1+8.3$

$\frac{3}{\left(x+1\right)^2}-2$

$\log_{10}\left(x\right)+\log_{10}\left(x+2\right)=\log_{10}\left(3\right)$

$-5y+3y^2+6y^3+7y^2+2y+4y-3y^3$