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Simplifying -4 + 4(4 + -3r) = -84 -4 + (4 * 4 + -3r * 4) = -84 -4 + (16 + -12r) = -84 Combine like terms: -4 + 16 = 12 12 + -12r = -84 Solving 12 + -12r = -84 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 + -12r = -84 + -12 Combine like terms: 12 + -12 = 0 0 + -12r = -84 + -12 -12r = -84 + -12 Combine like terms: -84 + -12 = -96 -12r = -96 Divide each side by '-12'. r = 8 Simplifying r = 8
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