Question

(3x-1,2)*7=10,5

-4*(z+7)=z*17

Answer 1

-4*(z+7)=z*17

-4z-28=17z

-4z-17z=28

21z=28

z=1,333...

 

Answer 2

1) 21x-8,4=10,5.
21x=10,5+8,4
21x=18,9.
x=0,9.
2) -4z-28=17z.
-4z-17z=28
-21z=28
z=-1,33.