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Simplifying 6 = 21 + b Solving 6 = 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. 6 + -1b = 21 + b + -1b Combine like terms: b + -1b = 0 6 + -1b = 21 + 0 6 + -1b = 21 Add '-6' to each side of the equation. 6 + -6 + -1b = 21 + -6 Combine like terms: 6 + -6 = 0 0 + -1b = 21 + -6 -1b = 21 + -6 Combine like terms: 21 + -6 = 15 -1b = 15 Divide each side by '-1'. b = -15 Simplifying b = -15
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