Answer:
Statement 1: (x-3)/6=-2 (you should always start with the given or other people won't know what you are trying to do)
Statement 2: x-3=-12
Statement 3: x=-9
You should be able to figure out the reasons for 2 and 3. If not, let me know.
A^2 +b^2=c^2. so 3^2=9 and 19^2=361
361-9=352 and then square root=18.76 or 18.8
Let the number be x.
4x - 8 =12
4x =12 +8 ( you bring the eight over to the 12, it becomes positive )
4x = 20
x = 20÷4
x = 5
