A-b=3a+b

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Solution for A-b=3a+b equation: 


Simplifying
A + -1b = 3a + b

Solving
A + -1b = 3a + b

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.
A + -1b + b = 3a + b + b

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

Combine like terms: b + b = 2b
A = 3a + 2b

Simplifying
A = 3a + 2b

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