-7a+3+8a=5-21

Solution for -7a+3+8a=5-21 equation:

Simplifying
-7a + 3 + 8a = 5 + -21

Reorder the terms:
3 + -7a + 8a = 5 + -21

Combine like terms: -7a + 8a = 1a
3 + 1a = 5 + -21

Combine like terms: 5 + -21 = -16
3 + 1a = -16

Solving
3 + 1a = -16

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 = -16 + -3

Combine like terms: 3 + -3 = 0
0 + 1a = -16 + -3
1a = -16 + -3

Combine like terms: -16 + -3 = -19
1a = -19

Divide each side by '1'.
a = -19

Simplifying
a = -19