$\left(a^{2x+1}-6\right)\left(a^{2x+1}+7\right)$

$3\cdot5^2-8$

$\int\left(\frac{2x-7}{\left(x^2-7x+6\right)^2}\right)dx$

$x^{10}=1024$

$\frac{2}{3}x=\frac{5}{12}x-2$

$\left(2x^2-5xy\right)\left(2x^2+5xy\right)$

$y=\frac{x^{\frac{3}{5}}\sqrt{x^2+x+1}}{\left(3x^2+1\right)^4}$