2+4(1-3a)=42

Solution for 2+4(1-3a)=42 equation:

Simplifying
2 + 4(1 + -3a) = 42
2 + (1 * 4 + -3a * 4) = 42
2 + (4 + -12a) = 42

Combine like terms: 2 + 4 = 6
6 + -12a = 42

Solving
6 + -12a = 42

Solving for variable 'a'.

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

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

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

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

Divide each side by '-12'.
a = -3

Simplifying
a = -3