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Simplifying -0.83(9 + 2d) = 40 (9 * -0.83 + 2d * -0.83) = 40 (-7.47 + -1.66d) = 40 Solving -7.47 + -1.66d = 40 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '7.47' to each side of the equation. -7.47 + 7.47 + -1.66d = 40 + 7.47 Combine like terms: -7.47 + 7.47 = 0.00 0.00 + -1.66d = 40 + 7.47 -1.66d = 40 + 7.47 Combine like terms: 40 + 7.47 = 47.47 -1.66d = 47.47 Divide each side by '-1.66'. d = -28.59638554 Simplifying d = -28.59638554
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