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Simplifying -21 = 7(3r + 8) Reorder the terms: -21 = 7(8 + 3r) -21 = (8 * 7 + 3r * 7) -21 = (56 + 21r) Solving -21 = 56 + 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. -21 + -21r = 56 + 21r + -21r Combine like terms: 21r + -21r = 0 -21 + -21r = 56 + 0 -21 + -21r = 56 Add '21' to each side of the equation. -21 + 21 + -21r = 56 + 21 Combine like terms: -21 + 21 = 0 0 + -21r = 56 + 21 -21r = 56 + 21 Combine like terms: 56 + 21 = 77 -21r = 77 Divide each side by '-21'. r = -3.666666667 Simplifying r = -3.666666667
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