Simplifying
x + 3 = 5

Reorder the terms:
3 + x = 5

Solving
3 + x = 5

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-3' to each side of the equation.
3 + -3 + x = 5 + -3

Combine like terms: 3 + -3 = 0
0 + x = 5 + -3
x = 5 + -3

Combine like terms: 5 + -3 = 2
x = 2

Simplifying
x = 2