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Simplifying 2(1B + -21) = 7D + -80 Reorder the terms: 2(-21 + 1B) = 7D + -80 (-21 * 2 + 1B * 2) = 7D + -80 (-42 + 2B) = 7D + -80 Reorder the terms: -42 + 2B = -80 + 7D Solving -42 + 2B = -80 + 7D Solving for variable 'B'. Move all terms containing B to the left, all other terms to the right. Add '42' to each side of the equation. -42 + 42 + 2B = -80 + 42 + 7D Combine like terms: -42 + 42 = 0 0 + 2B = -80 + 42 + 7D 2B = -80 + 42 + 7D Combine like terms: -80 + 42 = -38 2B = -38 + 7D Divide each side by '2'. B = -19 + 3.5D Simplifying B = -19 + 3.5D
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