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Simplifying 10 + -9(r + -1) = 0 Reorder the terms: 10 + -9(-1 + r) = 0 10 + (-1 * -9 + r * -9) = 0 10 + (9 + -9r) = 0 Combine like terms: 10 + 9 = 19 19 + -9r = 0 Solving 19 + -9r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-19' to each side of the equation. 19 + -19 + -9r = 0 + -19 Combine like terms: 19 + -19 = 0 0 + -9r = 0 + -19 -9r = 0 + -19 Combine like terms: 0 + -19 = -19 -9r = -19 Divide each side by '-9'. r = 2.111111111 Simplifying r = 2.111111111
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