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Simplifying -9 = r + (-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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