AB+BA=100

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Solution for AB+BA=100 equation: 


Simplifying
AB + BA = 100

Combine like terms: AB + AB = 2AB
2AB = 100

Solving
2AB = 100

Solving for variable 'A'.

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

Divide each side by '2B'.
A = 50B-1

Simplifying
A = 50B-1

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