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Simplifying 7b + 7(3 + -6b) = 126 7b + (3 * 7 + -6b * 7) = 126 7b + (21 + -42b) = 126 Reorder the terms: 21 + 7b + -42b = 126 Combine like terms: 7b + -42b = -35b 21 + -35b = 126 Solving 21 + -35b = 126 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -35b = 126 + -21 Combine like terms: 21 + -21 = 0 0 + -35b = 126 + -21 -35b = 126 + -21 Combine like terms: 126 + -21 = 105 -35b = 105 Divide each side by '-35'. b = -3 Simplifying b = -3
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