21-3s=s+5

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Solution for 21-3s=s+5 equation:


Simplifying
21 + -3s = s + 5

Reorder the terms:
21 + -3s = 5 + s

Solving
21 + -3s = 5 + 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.
21 + -3s + -1s = 5 + s + -1s

Combine like terms: -3s + -1s = -4s
21 + -4s = 5 + s + -1s

Combine like terms: s + -1s = 0
21 + -4s = 5 + 0
21 + -4s = 5

Add '-21' to each side of the equation.
21 + -21 + -4s = 5 + -21

Combine like terms: 21 + -21 = 0
0 + -4s = 5 + -21
-4s = 5 + -21

Combine like terms: 5 + -21 = -16
-4s = -16

Divide each side by '-4'.
s = 4

Simplifying
s = 4

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