9=21-4s

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Solution for 9=21-4s equation:


Simplifying
9 = 21 + -4s

Solving
9 = 21 + -4s

Solving for variable 's'.

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

Add '4s' to each side of the equation.
9 + 4s = 21 + -4s + 4s

Combine like terms: -4s + 4s = 0
9 + 4s = 21 + 0
9 + 4s = 21

Add '-9' to each side of the equation.
9 + -9 + 4s = 21 + -9

Combine like terms: 9 + -9 = 0
0 + 4s = 21 + -9
4s = 21 + -9

Combine like terms: 21 + -9 = 12
4s = 12

Divide each side by '4'.
s = 3

Simplifying
s = 3

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