How do you solve two step equations?

Lets say you are trying to find the X in this equation:

2x-8=18     1. find a way to leave the 2x by itself.

2x=26         2. since the 8 is a negative (-8), becase it has a  subtraction               sighn , you add it to the 18 on the opposite side so yu have the 2x by itself.

                   3. Now you have to divide since there is nothing else you can do.

You divide 26 by two and then 2 by 2. now you have x=13. 

This technique goes the same for if you have more that just two numbers that dont have a variable, but you said two step, so this is a prime example.  I hope this helped. :)

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)