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Simplifying -5(r + 3) = -57 Reorder the terms: -5(3 + r) = -57 (3 * -5 + r * -5) = -57 (-15 + -5r) = -57 Solving -15 + -5r = -57 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + -5r = -57 + 15 Combine like terms: -15 + 15 = 0 0 + -5r = -57 + 15 -5r = -57 + 15 Combine like terms: -57 + 15 = -42 -5r = -42 Divide each side by '-5'. r = 8.4 Simplifying r = 8.4
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