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Sagot :

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.