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Simplifying 8r + -1(5r + 12) = 15 Reorder the terms: 8r + -1(12 + 5r) = 15 8r + (12 * -1 + 5r * -1) = 15 8r + (-12 + -5r) = 15 Reorder the terms: -12 + 8r + -5r = 15 Combine like terms: 8r + -5r = 3r -12 + 3r = 15 Solving -12 + 3r = 15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 3r = 15 + 12 Combine like terms: -12 + 12 = 0 0 + 3r = 15 + 12 3r = 15 + 12 Combine like terms: 15 + 12 = 27 3r = 27 Divide each side by '3'. r = 9 Simplifying r = 9
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