r-t=s

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Solution for r-t=s equation: 


Simplifying
r + -1t = s

Solving
r + -1t = s

Solving for variable 'r'.

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

Add 't' to each side of the equation.
r + -1t + t = s + t

Combine like terms: -1t + t = 0
r + 0 = s + t
r = s + t

Simplifying
r = s + t

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