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Simplifying 84 = -4(4 + 5b) 84 = (4 * -4 + 5b * -4) 84 = (-16 + -20b) Solving 84 = -16 + -20b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '20b' to each side of the equation. 84 + 20b = -16 + -20b + 20b Combine like terms: -20b + 20b = 0 84 + 20b = -16 + 0 84 + 20b = -16 Add '-84' to each side of the equation. 84 + -84 + 20b = -16 + -84 Combine like terms: 84 + -84 = 0 0 + 20b = -16 + -84 20b = -16 + -84 Combine like terms: -16 + -84 = -100 20b = -100 Divide each side by '20'. b = -5 Simplifying b = -5
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