3b+6a=21

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Solution for 3b+6a=21 equation: 


Simplifying
3b + 6a = 21

Reorder the terms:
6a + 3b = 21

Solving
6a + 3b = 21

Solving for variable 'a'.

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

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

Combine like terms: 3b + -3b = 0
6a + 0 = 21 + -3b
6a = 21 + -3b

Divide each side by '6'.
a = 3.5 + -0.5b

Simplifying
a = 3.5 + -0.5b

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