A+x=b

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Solution for A+x=b equation: 


Simplifying
A + x = b

Solving
A + x = b

Solving for variable 'A'.

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

Add '-1x' to each side of the equation.
A + x + -1x = b + -1x

Combine like terms: x + -1x = 0
A + 0 = b + -1x
A = b + -1x

Simplifying
A = b + -1x

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