Answer :

rspill6

Answer:

x = -(27/8)

Step-by-step explanation:

8x + 5y -z = 0

y=4 and z = -7

8x + 5(4) -(-7) = 0

8x + 20 +7 = 0

8x = -27

x = -(27/8)

x = -24 and 3/8