x+(x+6)+x+(x+6)=20

Solution for x+(x+6)+x+(x+6)=20 equation:

Simplifying
x + (x + 6) + x + (x + 6) = 20

Reorder the terms:
x + (6 + x) + x + (x + 6) = 20

Remove parenthesis around (6 + x)
x + 6 + x + x + (x + 6) = 20

Reorder the terms:
x + 6 + x + x + (6 + x) = 20

Remove parenthesis around (6 + x)
x + 6 + x + x + 6 + x = 20

Reorder the terms:
6 + 6 + x + x + x + x = 20

Combine like terms: 6 + 6 = 12
12 + x + x + x + x = 20

Combine like terms: x + x = 2x
12 + 2x + x + x = 20

Combine like terms: 2x + x = 3x
12 + 3x + x = 20

Combine like terms: 3x + x = 4x
12 + 4x = 20

Solving
12 + 4x = 20

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + 4x = 20 + -12

Combine like terms: 12 + -12 = 0
0 + 4x = 20 + -12
4x = 20 + -12

Combine like terms: 20 + -12 = 8
4x = 8

Divide each side by '4'.
x = 2

Simplifying
x = 2