b+3a=21

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Solution for b+3a=21 equation: 


Simplifying
b + 3a = 21

Reorder the terms:
3a + b = 21

Solving
3a + b = 21

Solving for variable 'a'.

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

Add '-1b' to each side of the equation.
3a + b + -1b = 21 + -1b

Combine like terms: b + -1b = 0
3a + 0 = 21 + -1b
3a = 21 + -1b

Divide each side by '3'.
a = 7 + -0.3333333333b

Simplifying
a = 7 + -0.3333333333b

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