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Simplifying 84 = r(21) Reorder the terms for easier multiplication: 84 = 21r Solving 84 = 21r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-21r' to each side of the equation. 84 + -21r = 21r + -21r Combine like terms: 21r + -21r = 0 84 + -21r = 0 Add '-84' to each side of the equation. 84 + -84 + -21r = 0 + -84 Combine like terms: 84 + -84 = 0 0 + -21r = 0 + -84 -21r = 0 + -84 Combine like terms: 0 + -84 = -84 -21r = -84 Divide each side by '-21'. r = 4 Simplifying r = 4
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