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Simplifying 84 = 3(-7b + 7) Reorder the terms: 84 = 3(7 + -7b) 84 = (7 * 3 + -7b * 3) 84 = (21 + -21b) Solving 84 = 21 + -21b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '21b' to each side of the equation. 84 + 21b = 21 + -21b + 21b Combine like terms: -21b + 21b = 0 84 + 21b = 21 + 0 84 + 21b = 21 Add '-84' to each side of the equation. 84 + -84 + 21b = 21 + -84 Combine like terms: 84 + -84 = 0 0 + 21b = 21 + -84 21b = 21 + -84 Combine like terms: 21 + -84 = -63 21b = -63 Divide each side by '21'. b = -3 Simplifying b = -3
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