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Simplifying 15 = r + -1(-17) Multiply -1 * -17 15 = r + 17 Reorder the terms: 15 = 17 + r Solving 15 = 17 + 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. 15 + -1r = 17 + r + -1r Combine like terms: r + -1r = 0 15 + -1r = 17 + 0 15 + -1r = 17 Add '-15' to each side of the equation. 15 + -15 + -1r = 17 + -15 Combine like terms: 15 + -15 = 0 0 + -1r = 17 + -15 -1r = 17 + -15 Combine like terms: 17 + -15 = 2 -1r = 2 Divide each side by '-1'. r = -2 Simplifying r = -2
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