How do you solve the equation 51 2z 8z equals 23?

51 + 2z + 8z = 23

Collect 'like terms'

51 + 10z = 23

Subtract '51' from both sides

10z = 23 - 51 = -28

z = -28 /10

z = - 2.8

NB However, you have NOT indicated the mathematical signs !!!!!