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Question
Find out which operation must be done on both sides of these equation in order to solve them.
x + 9 = 11
Solution
Subtract 9 from both sides
x + 9 = 11
⇒ x + 9 − 9 = 11 − 9 (Subtract 9 from both sides)
⇒ x + 0 = 2
⇒ x = 2
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