3r+5s=21

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Solution for 3r+5s=21 equation: 


Simplifying
3r + 5s = 21

Solving
3r + 5s = 21

Solving for variable 'r'.

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

Add '-5s' to each side of the equation.
3r + 5s + -5s = 21 + -5s

Combine like terms: 5s + -5s = 0
3r + 0 = 21 + -5s
3r = 21 + -5s

Divide each side by '3'.
r = 7 + -1.666666667s

Simplifying
r = 7 + -1.666666667s

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