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Simplifying -4(r + 6) = -66 Reorder the terms: -4(6 + r) = -66 (6 * -4 + r * -4) = -66 (-24 + -4r) = -66 Solving -24 + -4r = -66 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '24' to each side of the equation. -24 + 24 + -4r = -66 + 24 Combine like terms: -24 + 24 = 0 0 + -4r = -66 + 24 -4r = -66 + 24 Combine like terms: -66 + 24 = -42 -4r = -42 Divide each side by '-4'. r = 10.5 Simplifying r = 10.5
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