$\frac{6x+2}{5}+\frac{4x-9}{3}=5$

$\left(2a^{3\:}b^4\right)^{\frac{3}{4}}$

$\left(-5\right)\cdot\:\left(-3\right)-\left[2+5\cdot\:\left(-4\right)-8+15:\left(-3\right)\cdot\:\left(-1\right)\right]$

$\left(m\:-\:3\:+\:4n\right)\:x\:\left(-8\right)$

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

$\left(3x^2y+7z\right)\left(3x^2y-2z\right)$

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