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Simplifying -15 = r + -1 Reorder the terms: -15 = -1 + r Solving -15 = -1 + 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 = -1 + r + -1r Combine like terms: r + -1r = 0 -15 + -1r = -1 + 0 -15 + -1r = -1 Add '15' to each side of the equation. -15 + 15 + -1r = -1 + 15 Combine like terms: -15 + 15 = 0 0 + -1r = -1 + 15 -1r = -1 + 15 Combine like terms: -1 + 15 = 14 -1r = 14 Divide each side by '-1'. r = -14 Simplifying r = -14
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