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Simplifying 2b + 21 = 8a + -9 Reorder the terms: 21 + 2b = 8a + -9 Reorder the terms: 21 + 2b = -9 + 8a Solving 21 + 2b = -9 + 8a 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 + 2b = -9 + -21 + 8a Combine like terms: 21 + -21 = 0 0 + 2b = -9 + -21 + 8a 2b = -9 + -21 + 8a Combine like terms: -9 + -21 = -30 2b = -30 + 8a Divide each side by '2'. b = -15 + 4a Simplifying b = -15 + 4a
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