3(x+4)+3x=42

Solution for 3(x+4)+3x=42 equation:

Simplifying
3(x + 4) + 3x = 42

Reorder the terms:
3(4 + x) + 3x = 42
(4 * 3 + x * 3) + 3x = 42
(12 + 3x) + 3x = 42

Combine like terms: 3x + 3x = 6x
12 + 6x = 42

Solving
12 + 6x = 42

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 + 6x = 42 + -12

Combine like terms: 12 + -12 = 0
0 + 6x = 42 + -12
6x = 42 + -12

Combine like terms: 42 + -12 = 30
6x = 30

Divide each side by '6'.
x = 5

Simplifying
x = 5