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Simplifying -3(3r + 2) = -42 Reorder the terms: -3(2 + 3r) = -42 (2 * -3 + 3r * -3) = -42 (-6 + -9r) = -42 Solving -6 + -9r = -42 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + -9r = -42 + 6 Combine like terms: -6 + 6 = 0 0 + -9r = -42 + 6 -9r = -42 + 6 Combine like terms: -42 + 6 = -36 -9r = -36 Divide each side by '-9'. r = 4 Simplifying r = 4
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