9A+3B=21

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Solution for 9A+3B=21 equation: 


Simplifying
9A + 3B = 21

Solving
9A + 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.
9A + 3B + -3B = 21 + -3B

Combine like terms: 3B + -3B = 0
9A + 0 = 21 + -3B
9A = 21 + -3B

Divide each side by '9'.
A = 2.333333333 + -0.3333333333B

Simplifying
A = 2.333333333 + -0.3333333333B

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