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Simplifying 21 + -1b = 8 Solving 21 + -1b = 8 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -1b = 8 + -21 Combine like terms: 21 + -21 = 0 0 + -1b = 8 + -21 -1b = 8 + -21 Combine like terms: 8 + -21 = -13 -1b = -13 Divide each side by '-1'. b = 13 Simplifying b = 13
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