X+(3+X)=43

Solution for X+(3+X)=43 equation:

Simplifying
X + (3 + X) = 43

Remove parenthesis around (3 + X)
X + 3 + X = 43

Reorder the terms:
3 + X + X = 43

Combine like terms: X + X = 2X
3 + 2X = 43

Solving
3 + 2X = 43

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 + 2X = 43 + -3

Combine like terms: 3 + -3 = 0
0 + 2X = 43 + -3
2X = 43 + -3

Combine like terms: 43 + -3 = 40
2X = 40

Divide each side by '2'.
X = 20

Simplifying
X = 20