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Simplifying -5(r + 7) = -66 Reorder the terms: -5(7 + r) = -66 (7 * -5 + r * -5) = -66 (-35 + -5r) = -66 Solving -35 + -5r = -66 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '35' to each side of the equation. -35 + 35 + -5r = -66 + 35 Combine like terms: -35 + 35 = 0 0 + -5r = -66 + 35 -5r = -66 + 35 Combine like terms: -66 + 35 = -31 -5r = -31 Divide each side by '-5'. r = 6.2 Simplifying r = 6.2
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