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Simplifying -105 = 7(3 + 3r) -105 = (3 * 7 + 3r * 7) -105 = (21 + 21r) Solving -105 = 21 + 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. -105 + -21r = 21 + 21r + -21r Combine like terms: 21r + -21r = 0 -105 + -21r = 21 + 0 -105 + -21r = 21 Add '105' to each side of the equation. -105 + 105 + -21r = 21 + 105 Combine like terms: -105 + 105 = 0 0 + -21r = 21 + 105 -21r = 21 + 105 Combine like terms: 21 + 105 = 126 -21r = 126 Divide each side by '-21'. r = -6 Simplifying r = -6
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