# The sum of two numbers is x. If one of the numbers is 12,what is the other ?

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We're given that one of the numbers is `12` . Call the other number `y.` Since the sum is equal to `x,` we can translate this into the mathematical statement

`12+y=x.`

We want to solve for `y,` so we isolate it by subtracting 12 from both sides. This gives `y=x-12.`

**If the sum of two numbers is `x` and one of the numbers is 12, then the other number is `x-12.` **

Check: `12+(x-12)=12+x-12=x.`