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Simplifying 3r(2) + -9r = 30 Reorder the terms for easier multiplication: 3 * 2r + -9r = 30 Multiply 3 * 2 6r + -9r = 30 Combine like terms: 6r + -9r = -3r -3r = 30 Solving -3r = 30 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by '-3'. r = -10 Simplifying r = -10
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