s=r-(-w)

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Solution for s=r-(-w) equation: 


Simplifying
s = r + -1(-1w)

Remove parenthesis around (-1w)
s = r + -1 * -1w

Multiply -1 * -1
s = r + 1w

Solving
s = r + 1w

Solving for variable 's'.

Move all terms containing s to the left, all other terms to the right.

Simplifying
s = r + 1w

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