3s-21=-12+2s

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Solution for 3s-21=-12+2s equation:


Simplifying
3s + -21 = -12 + 2s

Reorder the terms:
-21 + 3s = -12 + 2s

Solving
-21 + 3s = -12 + 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.
-21 + 3s + -2s = -12 + 2s + -2s

Combine like terms: 3s + -2s = 1s
-21 + 1s = -12 + 2s + -2s

Combine like terms: 2s + -2s = 0
-21 + 1s = -12 + 0
-21 + 1s = -12

Add '21' to each side of the equation.
-21 + 21 + 1s = -12 + 21

Combine like terms: -21 + 21 = 0
0 + 1s = -12 + 21
1s = -12 + 21

Combine like terms: -12 + 21 = 9
1s = 9

Divide each side by '1'.
s = 9

Simplifying
s = 9

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