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Simplifying -6(7 + -7.5r) = 28.5 (7 * -6 + -7.5r * -6) = 28.5 (-42 + 45r) = 28.5 Solving -42 + 45r = 28.5 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '42' to each side of the equation. -42 + 42 + 45r = 28.5 + 42 Combine like terms: -42 + 42 = 0 0 + 45r = 28.5 + 42 45r = 28.5 + 42 Combine like terms: 28.5 + 42 = 70.5 45r = 70.5 Divide each side by '45'. r = 1.566666667 Simplifying r = 1.566666667
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