Answer:

Step-by-step explanation:
= 
Answer:
c. x = 27
Step-by-step explanation:
-11 + 1/3 x + 9 = 7
1/3 x - 2 = 7
1/3 x = 9
x = 27
4 + -6 = -2 the lines go from 0 to 4 so + 4 then back 6 spots to -2 so 4 + -6 = -2
Answer:
a 0 = x + -x
Step-by-step explanation:
variables can be added just like numbers. a number and it's opposite sum to zero.
therefore, x and it's opposite (-x) sum to zero