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If 12=n-9, what is the value of n ?

If 12=n−9 12=n-9 , what is the value of n n ?

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Full solution

Q. If 12=n−9 12=n-9 , what is the value of n n ?
  1. Understanding the equation: Understand the equation.\newlineThe equation 12=n−912 = n - 9 means that when 99 is added to nn, the result is 1212.
  2. Isolating the variable nn: Isolate the variable nn. To find the value of nn, we need to isolate it on one side of the equation. We can do this by adding 99 to both sides of the equation.
  3. Adding 99 to both sides: Add 99 to both sides of the equation. \newline12+9=n−9+912 + 9 = n - 9 + 9\newlineThis simplifies to:\newline21=n21 = n

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