$\left(x-1\right)\left(2-x\right)+\left(2-x\right)=0$

$2x^4\:+\:3x^2\:-\:5x\:+\:7\:-\:-2x^2+4x\:-\:3$

$2\left(1+3u\right)-\left(1-4u\right)$

$\left(\frac{90\cdot y^a\cdot x^b\cdot z^3}{10\cdot x^b\cdot z^3}\right)^b$

$\int\frac{2}{5}\sqrt{x}dx$

$solve\:\left(log\left(x\right)\right)^2+2\left(log\left(x-3\right)\right)=0$

$\int\left(\frac{sin\left(9ln12x\right)}{7x}\right)dx$