$6x+2y=5x-4y+8$

$\frac{2\sin\left(x\right)-\sin2\left(x\right)}{2\sin^2\left(x\right)}=\frac{\sin\left(x\right)}{1+\cos\left(x\right)}$

$\left(b+7p\right)\left(b-7p\right)$

$\left(r^2\:y+7\right)\left(r^2+10\right)$

$\lim_{x\to-2}\left(3x^4+x^2\right)\cdot\left(x^2+1\right)$

$3\left(2+4x\right)$

$\sqrt{3}\cdot\left(\sqrt{60}+\sqrt{21}\right)-6\sqrt{5}$