a+3.1=6.6+-4a

Solution for a+3.1=6.6+-4a equation:

Simplifying
a + 3.1 = 6.6 + -4a

Reorder the terms:
3.1 + a = 6.6 + -4a

Solving
3.1 + a = 6.6 + -4a

Solving for variable 'a'.

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

Add '4a' to each side of the equation.
3.1 + a + 4a = 6.6 + -4a + 4a

Combine like terms: a + 4a = 5a
3.1 + 5a = 6.6 + -4a + 4a

Combine like terms: -4a + 4a = 0
3.1 + 5a = 6.6 + 0
3.1 + 5a = 6.6

Add '-3.1' to each side of the equation.
3.1 + -3.1 + 5a = 6.6 + -3.1

Combine like terms: 3.1 + -3.1 = 0.0
0.0 + 5a = 6.6 + -3.1
5a = 6.6 + -3.1

Combine like terms: 6.6 + -3.1 = 3.5
5a = 3.5

Divide each side by '5'.
a = 0.7

Simplifying
a = 0.7