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