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Simplifying 9 = r + -1(-15) Multiply -1 * -15 9 = r + 15 Reorder the terms: 9 = 15 + r Solving 9 = 15 + 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. 9 + -1r = 15 + r + -1r Combine like terms: r + -1r = 0 9 + -1r = 15 + 0 9 + -1r = 15 Add '-9' to each side of the equation. 9 + -9 + -1r = 15 + -9 Combine like terms: 9 + -9 = 0 0 + -1r = 15 + -9 -1r = 15 + -9 Combine like terms: 15 + -9 = 6 -1r = 6 Divide each side by '-1'. r = -6 Simplifying r = -6
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