Question

-4*(3-5z)=z-7 ||| 8*(2а-6)=2*(4а+3) помогите решить,даю 34 балла♥♥

Answer 1

- 4 * (3 - 5z) = z - 7

- 12 + 20z = z - 7

20z - z = - 7 + 12

19z = 5

$z=\frac{5}{19}$

8 * (2a - 6) = 2 * (4a + 3)

16a - 48 = 8a + 6

16a - 8a = 6 + 48

8a = 54

a = 6,75

Answer 2

1)
-12+20z=z-7
20z-z=-7+12
19z=5
z=5/19

2)
16a-48=8a+6
16a-8a=6+48
8a=54
a=27/4=6,75