-s+3=s+21

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


Simplifying
-1s + 3 = s + 21

Reorder the terms:
3 + -1s = s + 21

Reorder the terms:
3 + -1s = 21 + s

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

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

Combine like terms: s + -1s = 0
3 + -2s = 21 + 0
3 + -2s = 21

Add '-3' to each side of the equation.
3 + -3 + -2s = 21 + -3

Combine like terms: 3 + -3 = 0
0 + -2s = 21 + -3
-2s = 21 + -3

Combine like terms: 21 + -3 = 18
-2s = 18

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

Simplifying
s = -9

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