-4a+2+5a=6-21

Solution for -4a+2+5a=6-21 equation:

Simplifying
-4a + 2 + 5a = 6 + -21

Reorder the terms:
2 + -4a + 5a = 6 + -21

Combine like terms: -4a + 5a = 1a
2 + 1a = 6 + -21

Combine like terms: 6 + -21 = -15
2 + 1a = -15

Solving
2 + 1a = -15

Solving for variable 'a'.

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

Add '-2' to each side of the equation.
2 + -2 + 1a = -15 + -2

Combine like terms: 2 + -2 = 0
0 + 1a = -15 + -2
1a = -15 + -2

Combine like terms: -15 + -2 = -17
1a = -17

Divide each side by '1'.
a = -17

Simplifying
a = -17