s+r=a+b

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Solution for s+r=a+b equation: 


Simplifying
s + r = a + b

Reorder the terms:
r + s = a + b

Solving
r + s = a + b

Solving for variable 'r'.

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

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

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

Simplifying
r = a + b + -1s

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