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Simplifying 4 + 3(1 + 7b) = -28 4 + (1 * 3 + 7b * 3) = -28 4 + (3 + 21b) = -28 Combine like terms: 4 + 3 = 7 7 + 21b = -28 Solving 7 + 21b = -28 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 21b = -28 + -7 Combine like terms: 7 + -7 = 0 0 + 21b = -28 + -7 21b = -28 + -7 Combine like terms: -28 + -7 = -35 21b = -35 Divide each side by '21'. b = -1.666666667 Simplifying b = -1.666666667
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