A-3b=12

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Solution for A-3b=12 equation: 


Simplifying
A + -3b = 12

Solving
A + -3b = 12

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.
A + -3b + 3b = 12 + 3b

Combine like terms: -3b + 3b = 0
A + 0 = 12 + 3b
A = 12 + 3b

Simplifying
A = 12 + 3b

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