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Simplifying 2(3r + -6) = -42 Reorder the terms: 2(-6 + 3r) = -42 (-6 * 2 + 3r * 2) = -42 (-12 + 6r) = -42 Solving -12 + 6r = -42 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 6r = -42 + 12 Combine like terms: -12 + 12 = 0 0 + 6r = -42 + 12 6r = -42 + 12 Combine like terms: -42 + 12 = -30 6r = -30 Divide each side by '6'. r = -5 Simplifying r = -5
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