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

$f\left(x\right)=\frac{1}{7}x^7+\left(x^2+3\right)\left(x^2-x-3\right)+21$

$\frac{dy}{dx}=\frac{\left(x+2\right)^2}{x^5}$

$7-b+4a-5b-3a+10b+5$

$x^2-13x+140=0$

$\sqrt{x}\cdot\sqrt[8]{2x}^2$

$\left(a+b\right)\left(a-x\right)$