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2x + (4 + x) = 11

Remove parenthesis around (4 + x)

2x + 4 + x = 11

Reorder the terms:

4 + 2x + x = 11

Combine like terms: 2x + x = 3x

4 + 3x = 11

Solving

4 + 3x = 11

Solving for variable 'x'.

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

Add '-4' to each side of the equation.

4 + -4 + 3x = 11 + -4

Combine like terms: 4 + -4 = 0

0 + 3x = 11 + -4

3x = 11 + -4

Combine like terms: 11 + -4 = 7

3x = 7

Divide each side by '3'.

x = 2.333333333