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Simplifying 21(r + 19) = 672 Reorder the terms: 21(19 + r) = 672 (19 * 21 + r * 21) = 672 (399 + 21r) = 672 Solving 399 + 21r = 672 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-399' to each side of the equation. 399 + -399 + 21r = 672 + -399 Combine like terms: 399 + -399 = 0 0 + 21r = 672 + -399 21r = 672 + -399 Combine like terms: 672 + -399 = 273 21r = 273 Divide each side by '21'. r = 13 Simplifying r = 13
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