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Simplifying 3b + -2b + 7 = 21 Reorder the terms: 7 + 3b + -2b = 21 Combine like terms: 3b + -2b = 1b 7 + 1b = 21 Solving 7 + 1b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 1b = 21 + -7 Combine like terms: 7 + -7 = 0 0 + 1b = 21 + -7 1b = 21 + -7 Combine like terms: 21 + -7 = 14 1b = 14 Divide each side by '1'. b = 14 Simplifying b = 14
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