Question

Решите уравнения: 20 баллов даю.

 2*($\frac{2}{5}z$+1)+$3\frac{1}{3}$=4-$\frac{1}{2}$*($\frac{4}{5}z$-1)

Answer 1

2*(2/5z+1)+3 1/3=4 -1/2*(4/5z-1)=
4/5z+2+3 1/3=4-4/10z+1/2
4/5z+4/10z=4+1/2-2-3 1/3
1,2z=2.5-3 1/3
1.2z=-5/6
z=-5/6:12/10=-5/6*10/12
z=-25/36