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Simplifying 7r + 2(r + -4) + -4r = -12 Reorder the terms: 7r + 2(-4 + r) + -4r = -12 7r + (-4 * 2 + r * 2) + -4r = -12 7r + (-8 + 2r) + -4r = -12 Reorder the terms: -8 + 7r + 2r + -4r = -12 Combine like terms: 7r + 2r = 9r -8 + 9r + -4r = -12 Combine like terms: 9r + -4r = 5r -8 + 5r = -12 Solving -8 + 5r = -12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 5r = -12 + 8 Combine like terms: -8 + 8 = 0 0 + 5r = -12 + 8 5r = -12 + 8 Combine like terms: -12 + 8 = -4 5r = -4 Divide each side by '5'. r = -0.8 Simplifying r = -0.8
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