-4a+3+5a=12-20

Solution for -4a+3+5a=12-20 equation:

Simplifying
-4a + 3 + 5a = 12 + -20

Reorder the terms:
3 + -4a + 5a = 12 + -20

Combine like terms: -4a + 5a = 1a
3 + 1a = 12 + -20

Combine like terms: 12 + -20 = -8
3 + 1a = -8

Solving
3 + 1a = -8

Solving for variable 'a'.

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

Add '-3' to each side of the equation.
3 + -3 + 1a = -8 + -3

Combine like terms: 3 + -3 = 0
0 + 1a = -8 + -3
1a = -8 + -3

Combine like terms: -8 + -3 = -11
1a = -11

Divide each side by '1'.
a = -11

Simplifying
a = -11