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