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Simplifying -4(r + 7) = -66 Reorder the terms: -4(7 + r) = -66 (7 * -4 + r * -4) = -66 (-28 + -4r) = -66 Solving -28 + -4r = -66 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + -4r = -66 + 28 Combine like terms: -28 + 28 = 0 0 + -4r = -66 + 28 -4r = -66 + 28 Combine like terms: -66 + 28 = -38 -4r = -38 Divide each side by '-4'. r = 9.5 Simplifying r = 9.5
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