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Simplifying -12 = 3(r + 8) Reorder the terms: -12 = 3(8 + r) -12 = (8 * 3 + r * 3) -12 = (24 + 3r) Solving -12 = 24 + 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. -12 + -3r = 24 + 3r + -3r Combine like terms: 3r + -3r = 0 -12 + -3r = 24 + 0 -12 + -3r = 24 Add '12' to each side of the equation. -12 + 12 + -3r = 24 + 12 Combine like terms: -12 + 12 = 0 0 + -3r = 24 + 12 -3r = 24 + 12 Combine like terms: 24 + 12 = 36 -3r = 36 Divide each side by '-3'. r = -12 Simplifying r = -12
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