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Simplifying 7r = 5(r + 18) Reorder the terms: 7r = 5(18 + r) 7r = (18 * 5 + r * 5) 7r = (90 + 5r) Solving 7r = 90 + 5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5r' to each side of the equation. 7r + -5r = 90 + 5r + -5r Combine like terms: 7r + -5r = 2r 2r = 90 + 5r + -5r Combine like terms: 5r + -5r = 0 2r = 90 + 0 2r = 90 Divide each side by '2'. r = 45 Simplifying r = 45
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