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Simplifying -7 + 5(-4 + r) = -12 -7 + (-4 * 5 + r * 5) = -12 -7 + (-20 + 5r) = -12 Combine like terms: -7 + -20 = -27 -27 + 5r = -12 Solving -27 + 5r = -12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '27' to each side of the equation. -27 + 27 + 5r = -12 + 27 Combine like terms: -27 + 27 = 0 0 + 5r = -12 + 27 5r = -12 + 27 Combine like terms: -12 + 27 = 15 5r = 15 Divide each side by '5'. r = 3 Simplifying r = 3
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