21=5-s

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Solution for 21=5-s equation:


Simplifying
21 = 5 + -1s

Solving
21 = 5 + -1s

Solving for variable 's'.

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

Add 's' to each side of the equation.
21 + s = 5 + -1s + s

Combine like terms: -1s + s = 0
21 + s = 5 + 0
21 + s = 5

Add '-21' to each side of the equation.
21 + -21 + s = 5 + -21

Combine like terms: 21 + -21 = 0
0 + s = 5 + -21
s = 5 + -21

Combine like terms: 5 + -21 = -16
s = -16

Simplifying
s = -16

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