21-9=s

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Solution for 21-9=s equation:


Simplifying
21 + -9 = s

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

Solving
12 = s

Solving for variable 's'.

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

Add '-1s' to each side of the equation.
12 + -1s = s + -1s

Combine like terms: s + -1s = 0
12 + -1s = 0

Add '-12' to each side of the equation.
12 + -12 + -1s = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -1s = 0 + -12
-1s = 0 + -12

Combine like terms: 0 + -12 = -12
-1s = -12

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

Simplifying
s = 12

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