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Simplifying 84 = r(28) Reorder the terms for easier multiplication: 84 = 28r Solving 84 = 28r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-28r' to each side of the equation. 84 + -28r = 28r + -28r Combine like terms: 28r + -28r = 0 84 + -28r = 0 Add '-84' to each side of the equation. 84 + -84 + -28r = 0 + -84 Combine like terms: 84 + -84 = 0 0 + -28r = 0 + -84 -28r = 0 + -84 Combine like terms: 0 + -84 = -84 -28r = -84 Divide each side by '-28'. r = 3 Simplifying r = 3
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