6-21=s

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Solution for 6-21=s equation:


Simplifying
6 + -21 = s

Combine like terms: 6 + -21 = -15
-15 = s

Solving
-15 = 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.
-15 + -1s = s + -1s

Combine like terms: s + -1s = 0
-15 + -1s = 0

Add '15' to each side of the equation.
-15 + 15 + -1s = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -1s = 0 + 15
-1s = 0 + 15

Combine like terms: 0 + 15 = 15
-1s = 15

Divide each side by '-1'.
s = -15

Simplifying
s = -15

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