21a-6=3a

Solution for 21a-6=3a equation:

Simplifying
21a + -6 = 3a

Reorder the terms:
-6 + 21a = 3a

Solving
-6 + 21a = 3a

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
-6 + 21a + -3a = 3a + -3a

Combine like terms: 21a + -3a = 18a
-6 + 18a = 3a + -3a

Combine like terms: 3a + -3a = 0
-6 + 18a = 0

Add '6' to each side of the equation.
-6 + 6 + 18a = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 18a = 0 + 6
18a = 0 + 6

Combine like terms: 0 + 6 = 6
18a = 6

Divide each side by '18'.
a = 0.3333333333

Simplifying
a = 0.3333333333