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