x+3+x+3=28

Solution for x+3+x+3=28 equation:

Simplifying
x + 3 + x + 3 = 28

Reorder the terms:
3 + 3 + x + x = 28

Combine like terms: 3 + 3 = 6
6 + x + x = 28

Combine like terms: x + x = 2x
6 + 2x = 28

Solving
6 + 2x = 28

Solving for variable 'x'.

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

Add '-6' to each side of the equation.
6 + -6 + 2x = 28 + -6

Combine like terms: 6 + -6 = 0
0 + 2x = 28 + -6
2x = 28 + -6

Combine like terms: 28 + -6 = 22
2x = 22

Divide each side by '2'.
x = 11

Simplifying
x = 11