a+b=s

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Solution for a+b=s equation: 


Simplifying
a + b = s

Solving
a + b = s

Solving for variable 'a'.

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

Add '-1b' to each side of the equation.
a + b + -1b = -1b + s

Combine like terms: b + -1b = 0
a + 0 = -1b + s
a = -1b + s

Simplifying
a = -1b + s

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