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Simplifying 20 = 2[r + 7] Reorder the terms: 20 = 2[7 + r] 20 = [7 * 2 + r * 2] 20 = [14 + 2r] Solving 20 = 14 + 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 = 14 + 2r + -2r Combine like terms: 2r + -2r = 0 20 + -2r = 14 + 0 20 + -2r = 14 Add '-20' to each side of the equation. 20 + -20 + -2r = 14 + -20 Combine like terms: 20 + -20 = 0 0 + -2r = 14 + -20 -2r = 14 + -20 Combine like terms: 14 + -20 = -6 -2r = -6 Divide each side by '-2'. r = 3 Simplifying r = 3
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