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Simplifying 2b + -21 = b + -28 Reorder the terms: -21 + 2b = b + -28 Reorder the terms: -21 + 2b = -28 + b Solving -21 + 2b = -28 + 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. -21 + 2b + -1b = -28 + b + -1b Combine like terms: 2b + -1b = 1b -21 + 1b = -28 + b + -1b Combine like terms: b + -1b = 0 -21 + 1b = -28 + 0 -21 + 1b = -28 Add '21' to each side of the equation. -21 + 21 + 1b = -28 + 21 Combine like terms: -21 + 21 = 0 0 + 1b = -28 + 21 1b = -28 + 21 Combine like terms: -28 + 21 = -7 1b = -7 Divide each side by '1'. b = -7 Simplifying b = -7
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