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Simplifying -4(r + 8) = -66 Reorder the terms: -4(8 + r) = -66 (8 * -4 + r * -4) = -66 (-32 + -4r) = -66 Solving -32 + -4r = -66 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '32' to each side of the equation. -32 + 32 + -4r = -66 + 32 Combine like terms: -32 + 32 = 0 0 + -4r = -66 + 32 -4r = -66 + 32 Combine like terms: -66 + 32 = -34 -4r = -34 Divide each side by '-4'. r = 8.5 Simplifying r = 8.5
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