$-10\left(5t+5\right)-10\left(10t+6\right)$

$5x<30$

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

$\int\left(\frac{3.2^x-3^x.2}{2^x}\right)dx$

$-773\:\cdot\:-407\:$

$\left(6a^{3}+9a^{4}+7a-12-5a^{2}\right)+\left(3-3a^{4}+2a^{2}-8a\right)$

$6x^{4}y^{2}\left(12x^{5}\right)$