s=2s-21

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Solution for s=2s-21 equation: 


Simplifying
s = 2s + -21

Reorder the terms:
s = -21 + 2s

Solving
s = -21 + 2s

Solving for variable 's'.

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

Add '-2s' to each side of the equation.
s + -2s = -21 + 2s + -2s

Combine like terms: s + -2s = -1s
-1s = -21 + 2s + -2s

Combine like terms: 2s + -2s = 0
-1s = -21 + 0
-1s = -21

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

Simplifying
s = 21

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