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Simplifying 3r + -1(7r + 2) = 12 Reorder the terms: 3r + -1(2 + 7r) = 12 3r + (2 * -1 + 7r * -1) = 12 3r + (-2 + -7r) = 12 Reorder the terms: -2 + 3r + -7r = 12 Combine like terms: 3r + -7r = -4r -2 + -4r = 12 Solving -2 + -4r = 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 + -4r = 12 + 2 Combine like terms: -2 + 2 = 0 0 + -4r = 12 + 2 -4r = 12 + 2 Combine like terms: 12 + 2 = 14 -4r = 14 Divide each side by '-4'. r = -3.5 Simplifying r = -3.5
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