$\frac{3z-2}{z+1}=4-\frac{z+2}{z-1}$

$2x+3=-15$

$cos\left(x\right)sin\left(x\right)=\frac{1-cos\left(2x\right)}{4}$

$\left(-8\right)\left(-9\right)-2$

$5y^7\cdot4y^6$

$\lim_{x\to0}\left(x^4\sin\left(\frac{\pi}{x}\right)\right)$

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