15=s-15

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Solution for 15=s-15 equation: 


Simplifying
15 = s + -15

Reorder the terms:
15 = -15 + s

Solving
15 = -15 + 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.
15 + -1s = -15 + s + -1s

Combine like terms: s + -1s = 0
15 + -1s = -15 + 0
15 + -1s = -15

Add '-15' to each side of the equation.
15 + -15 + -1s = -15 + -15

Combine like terms: 15 + -15 = 0
0 + -1s = -15 + -15
-1s = -15 + -15

Combine like terms: -15 + -15 = -30
-1s = -30

Divide each side by '-1'.
s = 30

Simplifying
s = 30

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