(a+6a+a+6a)+(-3+6-3+6)=

Solution for (a+6a+a+6a)+(-3+6-3+6)= equation:

Simplifying
(a + 6a + a + 6a) + (-3 + 6 + -3 + 6) = 0

Combine like terms: a + 6a = 7a
(7a + a + 6a) + (-3 + 6 + -3 + 6) = 0

Combine like terms: 7a + a = 8a
(8a + 6a) + (-3 + 6 + -3 + 6) = 0

Combine like terms: 8a + 6a = 14a
(14a) + (-3 + 6 + -3 + 6) = 0
(14a) + (-3 + 6 + -3 + 6) = 0

Combine like terms: -3 + 6 = 3
(14a) + (3 + -3 + 6) = 0

Combine like terms: 3 + -3 = 0
(14a) + (0 + 6) = 0
(14a) + (6) = 0
(14a) + 6 = 0

Reorder the terms:
6 + (14a) = 0

Solving
6 + (14a) = 0

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 + (14a) = 0 + -6

Combine like terms: 6 + -6 = 0
0 + (14a) = 0 + -6
(14a) = 0 + -6

Combine like terms: 0 + -6 = -6
(14a) = -6

Divide each side by '14'.
a = -0.4285714286

Simplifying
a = -0.4285714286