$-4\left(n+2\right)-7\left(n+4\right)$

$5x+7y=50$

$-\left(x-1\right)^2.\left(x-1\right)^2$

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

$\lim_{x\to1}\left(\frac{\ln\left(x^2\right)}{sin\left(\pi x^2\right)}\right)$

$2x-1=191$

$\int_0^x\left(t^2ln\left(1+2t\right)\right)dt$