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Simplifying 126 = -3(-7b + -7) Reorder the terms: 126 = -3(-7 + -7b) 126 = (-7 * -3 + -7b * -3) 126 = (21 + 21b) Solving 126 = 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. 126 + -21b = 21 + 21b + -21b Combine like terms: 21b + -21b = 0 126 + -21b = 21 + 0 126 + -21b = 21 Add '-126' to each side of the equation. 126 + -126 + -21b = 21 + -126 Combine like terms: 126 + -126 = 0 0 + -21b = 21 + -126 -21b = 21 + -126 Combine like terms: 21 + -126 = -105 -21b = -105 Divide each side by '-21'. b = 5 Simplifying b = 5
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