Answer:
A. 20 - x = 5 X = 15
B. x + 2 = 7 X = 5
C. 3x = 15 X = 5
D. 5x = 15 X = 3
E. x - 5 = 0 X = 5
Explanation:
For A
Steps
20 - x = 5
subtract 20 from both sides.
20 - x - 20 = 5 - 20
Simplify
-x = -15
Divide both sides by negitive 1
-x/-1 = (-15)/ -1
Simplify
x = 15
For B
Steps
x + 2 = 7
subtract 2 from both sides.
x + 2 - 2 = 7 - 2
Simplify
x = 5
For C
Steps
3x = 15
Divide both sides by 3
3x/3 = 15/3
Simplify
x = 5
For D
Steps
5x = 15
Divide both sides by 5
5x/5 = 15/5
Simplify
X = 3
For E
Steps
x - 5 = 0
Add 5 to both sides
x - 5 + 5 = 0 + 5
Simplify
X = 5
That was A lot of math lol but I hope that helped