3s-21=-39+s

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Solution for 3s-21=-39+s equation:


Simplifying
3s + -21 = -39 + s

Reorder the terms:
-21 + 3s = -39 + s

Solving
-21 + 3s = -39 + 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 = -39 + s + -1s

Combine like terms: 3s + -1s = 2s
-21 + 2s = -39 + s + -1s

Combine like terms: s + -1s = 0
-21 + 2s = -39 + 0
-21 + 2s = -39

Add '21' to each side of the equation.
-21 + 21 + 2s = -39 + 21

Combine like terms: -21 + 21 = 0
0 + 2s = -39 + 21
2s = -39 + 21

Combine like terms: -39 + 21 = -18
2s = -18

Divide each side by '2'.
s = -9

Simplifying
s = -9

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