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Simplifying 7r + 3r + -30 = 0 Reorder the terms: -30 + 7r + 3r = 0 Combine like terms: 7r + 3r = 10r -30 + 10r = 0 Solving -30 + 10r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + 10r = 0 + 30 Combine like terms: -30 + 30 = 0 0 + 10r = 0 + 30 10r = 0 + 30 Combine like terms: 0 + 30 = 30 10r = 30 Divide each side by '10'. r = 3 Simplifying r = 3
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