$\left(-7\right)-\left(-7\right)+\left(-12\right)-\left(-4\right)+\left(-9\right)$

$2 y ( x + 1 ) d y = x d x$

$\left(2+\frac{5x}{3}\right)^2$

$2a-3\left(b+5c\right)+5$

$\left(x^2-5x+1\right)y^2$

$2\tan^2\left(x\right)\sin^2\left(x\right)=4\sin^4\left(x\right)+\sin^2\left(x\right)$

$\lim_{x\to\frac{\pi}{2}}\left(2x\tan\left(x\right)\frac{\pi}{\cos\left(x\right)}\right)$