3-21=6a

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Solution for 3-21=6a equation:


Simplifying
3 + -21 = 6a

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

Solving
-18 = 6a

Solving for variable 'a'.

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

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

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

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

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

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

Divide each side by '-6'.
a = -3

Simplifying
a = -3

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