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Simplifying 15 = 2(r + 5) Reorder the terms: 15 = 2(5 + r) 15 = (5 * 2 + r * 2) 15 = (10 + 2r) Solving 15 = 10 + 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 = 10 + 2r + -2r Combine like terms: 2r + -2r = 0 15 + -2r = 10 + 0 15 + -2r = 10 Add '-15' to each side of the equation. 15 + -15 + -2r = 10 + -15 Combine like terms: 15 + -15 = 0 0 + -2r = 10 + -15 -2r = 10 + -15 Combine like terms: 10 + -15 = -5 -2r = -5 Divide each side by '-2'. r = 2.5 Simplifying r = 2.5
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