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Simplifying 3b + 3(7 + -6b) = 126 3b + (7 * 3 + -6b * 3) = 126 3b + (21 + -18b) = 126 Reorder the terms: 21 + 3b + -18b = 126 Combine like terms: 3b + -18b = -15b 21 + -15b = 126 Solving 21 + -15b = 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 + -15b = 126 + -21 Combine like terms: 21 + -21 = 0 0 + -15b = 126 + -21 -15b = 126 + -21 Combine like terms: 126 + -21 = 105 -15b = 105 Divide each side by '-15'. b = -7 Simplifying b = -7
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