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Simplifying b + -1(7 + -1b) = 21 b + (7 * -1 + -1b * -1) = 21 b + (-7 + 1b) = 21 Reorder the terms: -7 + b + 1b = 21 Combine like terms: b + 1b = 2b -7 + 2b = 21 Solving -7 + 2b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 2b = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 2b = 21 + 7 2b = 21 + 7 Combine like terms: 21 + 7 = 28 2b = 28 Divide each side by '2'. b = 14 Simplifying b = 14
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