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Simplifying 28 = -4(3r + 5) Reorder the terms: 28 = -4(5 + 3r) 28 = (5 * -4 + 3r * -4) 28 = (-20 + -12r) Solving 28 = -20 + -12r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12r' to each side of the equation. 28 + 12r = -20 + -12r + 12r Combine like terms: -12r + 12r = 0 28 + 12r = -20 + 0 28 + 12r = -20 Add '-28' to each side of the equation. 28 + -28 + 12r = -20 + -28 Combine like terms: 28 + -28 = 0 0 + 12r = -20 + -28 12r = -20 + -28 Combine like terms: -20 + -28 = -48 12r = -48 Divide each side by '12'. r = -4 Simplifying r = -4
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