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Question
Find out which operation must be done on both sides of these equation in order to solve them.
x – 4 = 9
Solution
Add 4 to both sides
x − 4 = 9
⇒ x − 4 + 4 = 9 + 4 (Add 4 to both sides)
⇒ x + 0 = 13
⇒ x = 13
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