$-\left(-8\right)\cdot\left(-11\right)+\left(-3\right)\cdot\left(-15\right)-6\cdot\left(-20\right)$

$\lim_{x\to-3}\left(\frac{3x^2+1}{x^2-9}\right)$

$0.2628740125-\left(\frac{-0.9999984242\left(1.3-\:0.2628740125\right)}{12.78584918+0.9999984242}\right)$

$y^2-2y^2+1$

$-8x=-24$

$\log\left(10\right)x\:+39$

$\left(-5\right).\left(-3y+8\right)$