To solve a linear equation, we must move the variable "x" to the left, and all the numbers to the right.

When a digit or x is transferred to the other side, the sign in front of it changes: + to -, and - to +.

"37 - x = 15" => "-x = 15 - 37"

If we got "-x" on the left, then we need to change all the signs the other way around:

"-x = 15 - 37" => "x = -15 + 37"

Now we can calculate the answer:

"x = -15 + 37" => "x = 22"

Your answer: 22