2(a+3)-4a=30

Solution for 2(a+3)-4a=30 equation:

Simplifying
2(a + 3) + -4a = 30

Reorder the terms:
2(3 + a) + -4a = 30
(3 * 2 + a * 2) + -4a = 30
(6 + 2a) + -4a = 30

Combine like terms: 2a + -4a = -2a
6 + -2a = 30

Solving
6 + -2a = 30

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 + -2a = 30 + -6

Combine like terms: 6 + -6 = 0
0 + -2a = 30 + -6
-2a = 30 + -6

Combine like terms: 30 + -6 = 24
-2a = 24

Divide each side by '-2'.
a = -12

Simplifying
a = -12