r-3s=0

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Solution for r-3s=0 equation: 


Simplifying
r + -3s = 0

Solving
r + -3s = 0

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 = 0 + 3s

Combine like terms: -3s + 3s = 0
r + 0 = 0 + 3s
r = 0 + 3s
Remove the zero:
r = 3s

Simplifying
r = 3s

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