21=3s

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Solution for 21=3s equation:


Simplifying
21 = 3s

Solving
21 = 3s

Solving for variable 's'.

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

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

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

Add '-21' to each side of the equation.
21 + -21 + -3s = 0 + -21

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

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

Divide each side by '-3'.
s = 7

Simplifying
s = 7

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