(-3s)+(20s)+(-20s)-(-18s)=-15

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Solution for (-3s)+(20s)+(-20s)-(-18s)=-15 equation: 


Simplifying
(-3s) + (20s) + (-20s) + -1(-18s) = -15

Remove parenthesis around (-18s)
(-3s) + (20s) + (-20s) + -1 * -18s = -15

Multiply -1 * -18
(-3s) + (20s) + (-20s) + 18s = -15

Combine like terms: (-3s) + (20s) = 17s
17s + (-20s) + 18s = -15

Combine like terms: 17s + (-20s) = -3s
-3s + 18s = -15

Combine like terms: -3s + 18s = 15s
15s = -15

Solving
15s = -15

Solving for variable 's'.

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

Divide each side by '15'.
s = -1

Simplifying
s = -1

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