r+s+t=11

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Solution for r+s+t=11 equation: 


Simplifying
r + s + t = 11

Solving
r + s + t = 11

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 + t = 11 + -1s

Combine like terms: s + -1s = 0
r + 0 + t = 11 + -1s
r + t = 11 + -1s

Add '-1t' to each side of the equation.
r + t + -1t = 11 + -1s + -1t

Combine like terms: t + -1t = 0
r + 0 = 11 + -1s + -1t
r = 11 + -1s + -1t

Simplifying
r = 11 + -1s + -1t

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