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Simplifying 9 + -1(2b + -6) = 21 Reorder the terms: 9 + -1(-6 + 2b) = 21 9 + (-6 * -1 + 2b * -1) = 21 9 + (6 + -2b) = 21 Combine like terms: 9 + 6 = 15 15 + -2b = 21 Solving 15 + -2b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -2b = 21 + -15 Combine like terms: 15 + -15 = 0 0 + -2b = 21 + -15 -2b = 21 + -15 Combine like terms: 21 + -15 = 6 -2b = 6 Divide each side by '-2'. b = -3 Simplifying b = -3
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