3(3+4x)-3=42

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

Simplifying
3(3 + 4x) + -3 = 42
(3 * 3 + 4x * 3) + -3 = 42
(9 + 12x) + -3 = 42

Reorder the terms:
9 + -3 + 12x = 42

Combine like terms: 9 + -3 = 6
6 + 12x = 42

Solving
6 + 12x = 42

Solving for variable 'x'.

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

Add '-6' to each side of the equation.
6 + -6 + 12x = 42 + -6

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

Combine like terms: 42 + -6 = 36
12x = 36

Divide each side by '12'.
x = 3

Simplifying
x = 3