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Simplifying (-2r + 7s) + 2(r + s) = 0 Remove parenthesis around (-2r + 7s) -2r + 7s + 2(r + s) = 0 -2r + 7s + (r * 2 + s * 2) = 0 -2r + 7s + (2r + 2s) = 0 Reorder the terms: -2r + 2r + 7s + 2s = 0 Combine like terms: -2r + 2r = 0 0 + 7s + 2s = 0 7s + 2s = 0 Combine like terms: 7s + 2s = 9s 9s = 0 Solving 9s = 0 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Divide each side by '9'. s = 0 Simplifying s = 0
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