-6a+2+7a=5-21

Solution for -6a+2+7a=5-21 equation:

Simplifying
-6a + 2 + 7a = 5 + -21

Reorder the terms:
2 + -6a + 7a = 5 + -21

Combine like terms: -6a + 7a = 1a
2 + 1a = 5 + -21

Combine like terms: 5 + -21 = -16
2 + 1a = -16

Solving
2 + 1a = -16

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 = -16 + -2

Combine like terms: 2 + -2 = 0
0 + 1a = -16 + -2
1a = -16 + -2

Combine like terms: -16 + -2 = -18
1a = -18

Divide each side by '1'.
a = -18

Simplifying
a = -18