3a+7b+4+7a=0

Solution for 3a+7b+4+7a=0 equation:

Simplifying
3a + 7b + 4 + 7a = 0

Reorder the terms:
4 + 3a + 7a + 7b = 0

Combine like terms: 3a + 7a = 10a
4 + 10a + 7b = 0

Solving
4 + 10a + 7b = 0

Solving for variable 'a'.

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

Add '-4' to each side of the equation.
4 + 10a + -4 + 7b = 0 + -4

Reorder the terms:
4 + -4 + 10a + 7b = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 10a + 7b = 0 + -4
10a + 7b = 0 + -4

Combine like terms: 0 + -4 = -4
10a + 7b = -4

Add '-7b' to each side of the equation.
10a + 7b + -7b = -4 + -7b

Combine like terms: 7b + -7b = 0
10a + 0 = -4 + -7b
10a = -4 + -7b

Divide each side by '10'.
a = -0.4 + -0.7b

Simplifying
a = -0.4 + -0.7b