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Simplifying 30x2 + 7d + -15 = 0 Reorder the terms: -15 + 7d + 30x2 = 0 Solving -15 + 7d + 30x2 = 0 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 7d + 15 + 30x2 = 0 + 15 Reorder the terms: -15 + 15 + 7d + 30x2 = 0 + 15 Combine like terms: -15 + 15 = 0 0 + 7d + 30x2 = 0 + 15 7d + 30x2 = 0 + 15 Combine like terms: 0 + 15 = 15 7d + 30x2 = 15 Add '-30x2' to each side of the equation. 7d + 30x2 + -30x2 = 15 + -30x2 Combine like terms: 30x2 + -30x2 = 0 7d + 0 = 15 + -30x2 7d = 15 + -30x2 Divide each side by '7'. d = 2.142857143 + -4.285714286x2 Simplifying d = 2.142857143 + -4.285714286x2
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