To solve the equation, we need to simplify the left side first:

275 - (113 + x) + 63 = 158

First, let's simplify the expression inside the parentheses:

275 - 113 - x + 63 = 158

Combine like terms:

162 - x + 63 = 158

Combine like terms again:

225 - x = 158

Now, let's isolate the variable by subtracting 225 from both sides:

225 - x - 225 = 158 - 225

Simplifying:

-x = -67

To solve for x, we need to multiply both sides by -1 to get rid of the negative sign:

(-1)(-x) = (-1)(-67)

Simplifying:

x = 67

Therefore, the solution to the equation is x = 67.