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Simplifying 3(1 + -7r) = -28 (1 * 3 + -7r * 3) = -28 (3 + -21r) = -28 Solving 3 + -21r = -28 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -21r = -28 + -3 Combine like terms: 3 + -3 = 0 0 + -21r = -28 + -3 -21r = -28 + -3 Combine like terms: -28 + -3 = -31 -21r = -31 Divide each side by '-21'. r = 1.476190476 Simplifying r = 1.476190476
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