9-s=21

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Solution for 9-s=21 equation:


Simplifying
9 + -1s = 21

Solving
9 + -1s = 21

Solving for variable 's'.

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

Add '-9' to each side of the equation.
9 + -9 + -1s = 21 + -9

Combine like terms: 9 + -9 = 0
0 + -1s = 21 + -9
-1s = 21 + -9

Combine like terms: 21 + -9 = 12
-1s = 12

Divide each side by '-1'.
s = -12

Simplifying
s = -12

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