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Simplifying 7r + 7(r + 25) = 805 Reorder the terms: 7r + 7(25 + r) = 805 7r + (25 * 7 + r * 7) = 805 7r + (175 + 7r) = 805 Reorder the terms: 175 + 7r + 7r = 805 Combine like terms: 7r + 7r = 14r 175 + 14r = 805 Solving 175 + 14r = 805 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-175' to each side of the equation. 175 + -175 + 14r = 805 + -175 Combine like terms: 175 + -175 = 0 0 + 14r = 805 + -175 14r = 805 + -175 Combine like terms: 805 + -175 = 630 14r = 630 Divide each side by '14'. r = 45 Simplifying r = 45
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