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