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Simplifying 2r + -3(-2) + -4 = 12 Multiply -3 * -2 2r + 6 + -4 = 12 Reorder the terms: 6 + -4 + 2r = 12 Combine like terms: 6 + -4 = 2 2 + 2r = 12 Solving 2 + 2r = 12 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 2r = 12 + -2 Combine like terms: 2 + -2 = 0 0 + 2r = 12 + -2 2r = 12 + -2 Combine like terms: 12 + -2 = 10 2r = 10 Divide each side by '2'. r = 5 Simplifying r = 5
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