Помогите плж 3z+6/7 = -z - 2/5

Question

Помогите плж

3z+6/7 = -z - 2/5

Answer 1

3z+6/7= -z-2/5
3z+z= - 2/5-6/7
4z= -(14+30)/35
4z= - 28/35= - 4/5
z= - 4/5:4
z= - 1/5