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Simplifying 5r + -1(-4 + 1) = -12 Combine like terms: -4 + 1 = -3 5r + -1(-3) = -12 Multiply -1 * -3 5r + 3 = -12 Reorder the terms: 3 + 5r = -12 Solving 3 + 5r = -12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 5r = -12 + -3 Combine like terms: 3 + -3 = 0 0 + 5r = -12 + -3 5r = -12 + -3 Combine like terms: -12 + -3 = -15 5r = -15 Divide each side by '5'. r = -3 Simplifying r = -3
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