Z is a constant variable in this equation. A constant variable is a variable, the value of which can never change. In this case, z would be equal to 7.
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8z + 3 - 2z < 51 6z + 3 < 51 6z < 48 z < 6 ☺
z = -2
-8z + 5z = -3z
10x + 2y + 8z - 5x + 4z - 4y = 10x - 5x + 2y - 4y + 8z + 4z = (10 - 5)x + (2 - 4)y + (8 + 4)z = 5x - 2y + 12z
By collecting like terms: 8z+4-2x