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Simplifying -9 = -21 + b Solving -9 = -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. -9 + -1b = -21 + b + -1b Combine like terms: b + -1b = 0 -9 + -1b = -21 + 0 -9 + -1b = -21 Add '9' to each side of the equation. -9 + 9 + -1b = -21 + 9 Combine like terms: -9 + 9 = 0 0 + -1b = -21 + 9 -1b = -21 + 9 Combine like terms: -21 + 9 = -12 -1b = -12 Divide each side by '-1'. b = 12 Simplifying b = 12
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