6a=21+3a

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Solution for 6a=21+3a equation: 


Simplifying
6a = 21 + 3a

Solving
6a = 21 + 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.
6a + -3a = 21 + 3a + -3a

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

Combine like terms: 3a + -3a = 0
3a = 21 + 0
3a = 21

Divide each side by '3'.
a = 7

Simplifying
a = 7

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