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Simplifying 3r + 2(r + -4) = 12 Reorder the terms: 3r + 2(-4 + r) = 12 3r + (-4 * 2 + r * 2) = 12 3r + (-8 + 2r) = 12 Reorder the terms: -8 + 3r + 2r = 12 Combine like terms: 3r + 2r = 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 = 20 5r = 20 Divide each side by '5'. r = 4 Simplifying r = 4
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