r+3s=7

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Solution for r+3s=7 equation: 


Simplifying
r + 3s = 7

Solving
r + 3s = 7

Solving for variable 'r'.

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

Add '-3s' to each side of the equation.
r + 3s + -3s = 7 + -3s

Combine like terms: 3s + -3s = 0
r + 0 = 7 + -3s
r = 7 + -3s

Simplifying
r = 7 + -3s

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