A-3x=b

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Solution for A-3x=b equation: 


Simplifying
A + -3x = b

Solving
A + -3x = b

Solving for variable 'A'.

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

Add '3x' to each side of the equation.
A + -3x + 3x = b + 3x

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

Simplifying
A = b + 3x

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