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Simplifying -9 = 2r + -15 Reorder the terms: -9 = -15 + 2r Solving -9 = -15 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. -9 + -2r = -15 + 2r + -2r Combine like terms: 2r + -2r = 0 -9 + -2r = -15 + 0 -9 + -2r = -15 Add '9' to each side of the equation. -9 + 9 + -2r = -15 + 9 Combine like terms: -9 + 9 = 0 0 + -2r = -15 + 9 -2r = -15 + 9 Combine like terms: -15 + 9 = -6 -2r = -6 Divide each side by '-2'. r = 3 Simplifying r = 3
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