2(x+3)+(x+3)=54

Solution for 2(x+3)+(x+3)=54 equation:

Simplifying
2(x + 3) + (x + 3) = 54

Reorder the terms:
2(3 + x) + (x + 3) = 54
(3 * 2 + x * 2) + (x + 3) = 54
(6 + 2x) + (x + 3) = 54

Reorder the terms:
6 + 2x + (3 + x) = 54

Remove parenthesis around (3 + x)
6 + 2x + 3 + x = 54

Reorder the terms:
6 + 3 + 2x + x = 54

Combine like terms: 6 + 3 = 9
9 + 2x + x = 54

Combine like terms: 2x + x = 3x
9 + 3x = 54

Solving
9 + 3x = 54

Solving for variable 'x'.

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

Add '-9' to each side of the equation.
9 + -9 + 3x = 54 + -9

Combine like terms: 9 + -9 = 0
0 + 3x = 54 + -9
3x = 54 + -9

Combine like terms: 54 + -9 = 45
3x = 45

Divide each side by '3'.
x = 15

Simplifying
x = 15