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Simplifying -105 = -3(7 + 7r) -105 = (7 * -3 + 7r * -3) -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 = 84 21r = 84 Divide each side by '21'. r = 4 Simplifying r = 4
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