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Simplifying 7 + -1(-2 + -1r + s) = 0 7 + (-2 * -1 + -1r * -1 + s * -1) = 0 7 + (2 + 1r + -1s) = 0 Combine like terms: 7 + 2 = 9 9 + 1r + -1s = 0 Solving 9 + 1r + -1s = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + 1r + -9 + -1s = 0 + -9 Reorder the terms: 9 + -9 + 1r + -1s = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 1r + -1s = 0 + -9 1r + -1s = 0 + -9 Combine like terms: 0 + -9 = -9 1r + -1s = -9 Add 's' to each side of the equation. 1r + -1s + s = -9 + s Combine like terms: -1s + s = 0 1r + 0 = -9 + s 1r = -9 + s Divide each side by '1'. r = -9 + s Simplifying r = -9 + s
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