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Simplifying D(x) = 80 + -0.2x Multiply D * x xD = 80 + -0.2x Solving xD = 80 + -0.2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2x' to each side of the equation. 0.2x + xD = 80 + -0.2x + 0.2x Combine like terms: -0.2x + 0.2x = 0.0 0.2x + xD = 80 + 0.0 0.2x + xD = 80 Reorder the terms: -80 + 0.2x + xD = 80 + -80 Combine like terms: 80 + -80 = 0 -80 + 0.2x + xD = 0 The solution to this equation could not be determined.
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