2a+6(1+3a)=126

Solution for 2a+6(1+3a)=126 equation:

Simplifying
2a + 6(1 + 3a) = 126
2a + (1 * 6 + 3a * 6) = 126
2a + (6 + 18a) = 126

Reorder the terms:
6 + 2a + 18a = 126

Combine like terms: 2a + 18a = 20a
6 + 20a = 126

Solving
6 + 20a = 126

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 + 20a = 126 + -6

Combine like terms: 6 + -6 = 0
0 + 20a = 126 + -6
20a = 126 + -6

Combine like terms: 126 + -6 = 120
20a = 120

Divide each side by '20'.
a = 6

Simplifying
a = 6