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Simplifying 21 + -2b = b Solving 21 + -2b = 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 = b + -1b Combine like terms: -2b + -1b = -3b 21 + -3b = b + -1b Combine like terms: b + -1b = 0 21 + -3b = 0 Add '-21' to each side of the equation. 21 + -21 + -3b = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -3b = 0 + -21 -3b = 0 + -21 Combine like terms: 0 + -21 = -21 -3b = -21 Divide each side by '-3'. b = 7 Simplifying b = 7
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