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Simplifying 9r + 4 + -7r = 30 Reorder the terms: 4 + 9r + -7r = 30 Combine like terms: 9r + -7r = 2r 4 + 2r = 30 Solving 4 + 2r = 30 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 2r = 30 + -4 Combine like terms: 4 + -4 = 0 0 + 2r = 30 + -4 2r = 30 + -4 Combine like terms: 30 + -4 = 26 2r = 26 Divide each side by '2'. r = 13 Simplifying r = 13
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