3a=21+b

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Solution for 3a=21+b equation: 


Simplifying
3a = 21 + b

Solving
3a = 21 + b

Solving for variable 'a'.

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

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

Simplifying
a = 7 + 0.3333333333b

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