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Simplifying 8 + 4(3 + -3r) = 104 8 + (3 * 4 + -3r * 4) = 104 8 + (12 + -12r) = 104 Combine like terms: 8 + 12 = 20 20 + -12r = 104 Solving 20 + -12r = 104 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -12r = 104 + -20 Combine like terms: 20 + -20 = 0 0 + -12r = 104 + -20 -12r = 104 + -20 Combine like terms: 104 + -20 = 84 -12r = 84 Divide each side by '-12'. r = -7 Simplifying r = -7
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