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