r+s=t

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Solution for r+s=t equation: 


Simplifying
r + s = t

Solving
r + s = t

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 = -1s + t

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

Simplifying
r = -1s + t

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