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Simplifying -3(r + 8) + 12 = 0 Reorder the terms: -3(8 + r) + 12 = 0 (8 * -3 + r * -3) + 12 = 0 (-24 + -3r) + 12 = 0 Reorder the terms: -24 + 12 + -3r = 0 Combine like terms: -24 + 12 = -12 -12 + -3r = 0 Solving -12 + -3r = 0 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 = 0 + 12 Combine like terms: -12 + 12 = 0 0 + -3r = 0 + 12 -3r = 0 + 12 Combine like terms: 0 + 12 = 12 -3r = 12 Divide each side by '-3'. r = -4 Simplifying r = -4
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