Answer:
1. x + 13 + (-13) = 20 + (-13)
x = 7
2. x - 11 + 11 = -3 + 11
x = 8
3. 5 * (x/5) = 2 * 5
x = 10
Step-by-step explanation:
1. Adding (-13) to both sides leaves the variable x on the left side, thus we get its value.
2. Adding 11 to both sides also leaves the variable x on one side of the equation, obtaining its value.
3. Multiplying 5 on both sides turns x/5 into a whole number and leaving it on the left side, we get its value.
