80-x+145=135

To find the value of x, we need to isolate the variable on one side of the equation.

Starting with the given equation:

80 - x + 145 = 135

Combine like terms on the left side:

225 - x = 135

Now, we want to move the constant term to the other side:

225 - x - 225 = 135 - 225

Simplifying:

-x = -90

To solve for x, we need to isolate the variable, so we multiply both sides by -1:

-x * (-1) = -90 * (-1)

This gives us:

x = 90

Thus, the value of x is 90.