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Simplifying 0.9d + 0.62(7000 + -1d) = 0.21(2000) 0.9d + (7000 * 0.62 + -1d * 0.62) = 0.21(2000) 0.9d + (4340 + -0.62d) = 0.21(2000) Reorder the terms: 4340 + 0.9d + -0.62d = 0.21(2000) Combine like terms: 0.9d + -0.62d = 0.28d 4340 + 0.28d = 0.21(2000) Multiply 0.21 * 2000 4340 + 0.28d = 420 Solving 4340 + 0.28d = 420 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-4340' to each side of the equation. 4340 + -4340 + 0.28d = 420 + -4340 Combine like terms: 4340 + -4340 = 0 0 + 0.28d = 420 + -4340 0.28d = 420 + -4340 Combine like terms: 420 + -4340 = -3920 0.28d = -3920 Divide each side by '0.28'. d = -14000 Simplifying d = -14000
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