3A-B=19

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Solution for 3A-B=19 equation: 


Simplifying
3A + -1B = 19

Solving
3A + -1B = 19

Solving for variable 'A'.

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

Add 'B' to each side of the equation.
3A + -1B + B = 19 + B

Combine like terms: -1B + B = 0
3A + 0 = 19 + B
3A = 19 + B

Divide each side by '3'.
A = 6.333333333 + 0.3333333333B

Simplifying
A = 6.333333333 + 0.3333333333B

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