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Simplifying -9s = 7 + -9s Add '9s' to each side of the equation. -9s + 9s = 7 + -9s + 9s Combine like terms: -9s + 9s = 0 0 = 7 + -9s + 9s Combine like terms: -9s + 9s = 0 0 = 7 + 0 0 = 7 Solving 0 = 7 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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