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