$\left(12a-7a+4c\right)-\left(-13a-5b+4c\right)$

$h+h+h+h-h-h$

$10\log\left(u\right)-13\log\left(v\right)-10\log\left(z\right)$

$\left(-7\right)\:-\:\left(-4\right)\:-\:\left(-5\right)$

$\left(6a^3b+2a^2b^2\right)^2$

$\int_0^{\frac{\pi}{4}}\left(\frac{\left(1+\cos\left(x\right)\right)}{\cos\left(x\right)^2}\right)dx$

$\int\left(4\left(4x+9\right)^6\right)dx$