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Simplifying 5 + 15 = 2r + 6 Combine like terms: 5 + 15 = 20 20 = 2r + 6 Reorder the terms: 20 = 6 + 2r Solving 20 = 6 + 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. 20 + -2r = 6 + 2r + -2r Combine like terms: 2r + -2r = 0 20 + -2r = 6 + 0 20 + -2r = 6 Add '-20' to each side of the equation. 20 + -20 + -2r = 6 + -20 Combine like terms: 20 + -20 = 0 0 + -2r = 6 + -20 -2r = 6 + -20 Combine like terms: 6 + -20 = -14 -2r = -14 Divide each side by '-2'. r = 7 Simplifying r = 7
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