$7\left(6\right)$

$\:\left(3x\:-\:4\right)\:\left(3x\:+\:4\right)\:=\:9x^2\:-\:8\:$

$\int\frac{\left(ln\left(x\right)\right)^{45}}{x}dx$

$5a^4+3a^2+a^4+4a^2$

$\left(wz+8w\right)$

$\frac{8x^5+5x^3+5x^2+8x+16}{2x^3+x^2+3}$

$7-\left(12+13-14\right)\cdot3+\left(25-4\cdot6\right)-\frac{75}{\left(123-35\cdot3-3\right)}$