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Simplifying 2r + 2(r + 5) = 70 Reorder the terms: 2r + 2(5 + r) = 70 2r + (5 * 2 + r * 2) = 70 2r + (10 + 2r) = 70 Reorder the terms: 10 + 2r + 2r = 70 Combine like terms: 2r + 2r = 4r 10 + 4r = 70 Solving 10 + 4r = 70 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + 4r = 70 + -10 Combine like terms: 10 + -10 = 0 0 + 4r = 70 + -10 4r = 70 + -10 Combine like terms: 70 + -10 = 60 4r = 60 Divide each side by '4'. r = 15 Simplifying r = 15
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