From the set (55,17,12) use substitution to determine which value of x makes the equation true.

5x=60

To determine which value of x makes the equation true, we can substitute each value in the set (55, 17, 12) into the equation and check whether the equation holds.

For the equation 5x = 60:
1. Substitute x = 55:
5 * 55 = 275, which is not equal to 60.
2. Substitute x = 17:
5 * 17 = 85, which is not equal to 60.
3. Substitute x = 12:
5 * 12 = 60, which is equal to 60.

Therefore, the value of x that makes the equation 5x = 60 true is x = 12.