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Simplifying 7r + 5 + 8r + 9 = 90 Reorder the terms: 5 + 9 + 7r + 8r = 90 Combine like terms: 5 + 9 = 14 14 + 7r + 8r = 90 Combine like terms: 7r + 8r = 15r 14 + 15r = 90 Solving 14 + 15r = 90 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + 15r = 90 + -14 Combine like terms: 14 + -14 = 0 0 + 15r = 90 + -14 15r = 90 + -14 Combine like terms: 90 + -14 = 76 15r = 76 Divide each side by '15'. r = 5.066666667 Simplifying r = 5.066666667
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