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Simplifying -5(r + 3) = -51 Reorder the terms: -5(3 + r) = -51 (3 * -5 + r * -5) = -51 (-15 + -5r) = -51 Solving -15 + -5r = -51 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 = -51 + 15 Combine like terms: -15 + 15 = 0 0 + -5r = -51 + 15 -5r = -51 + 15 Combine like terms: -51 + 15 = -36 -5r = -36 Divide each side by '-5'. r = 7.2 Simplifying r = 7.2
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