30-s=9

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Solution for 30-s=9 equation: 


Simplifying
30 + -1s = 9

Solving
30 + -1s = 9

Solving for variable 's'.

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

Add '-30' to each side of the equation.
30 + -30 + -1s = 9 + -30

Combine like terms: 30 + -30 = 0
0 + -1s = 9 + -30
-1s = 9 + -30

Combine like terms: 9 + -30 = -21
-1s = -21

Divide each side by '-1'.
s = 21

Simplifying
s = 21

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