Answer:
17
step by step solution:
6 = 3z - 45
What I like to do is move everythint that has letters to the left and everything that doesn't to the right. Moving a number to another side either makes them a negative or a positive.
-3z + 6 = -45
We move the 6 to the right side.
-3z = -51
To get z, we just have to divide what we have left on the right side by the left side (without the letter). We get this.
z = -51 / (-3)
Calculate -51 / (-3) and you get your answer.
z = 17