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Simplifying 1200 + 100d = -190d Solving 1200 + 100d = -190d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '190d' to each side of the equation. 1200 + 100d + 190d = -190d + 190d Combine like terms: 100d + 190d = 290d 1200 + 290d = -190d + 190d Combine like terms: -190d + 190d = 0 1200 + 290d = 0 Add '-1200' to each side of the equation. 1200 + -1200 + 290d = 0 + -1200 Combine like terms: 1200 + -1200 = 0 0 + 290d = 0 + -1200 290d = 0 + -1200 Combine like terms: 0 + -1200 = -1200 290d = -1200 Divide each side by '290'. d = -4.137931034 Simplifying d = -4.137931034
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