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