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Simplifying 4 + 7d = 9d Solving 4 + 7d = 9d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-9d' to each side of the equation. 4 + 7d + -9d = 9d + -9d Combine like terms: 7d + -9d = -2d 4 + -2d = 9d + -9d Combine like terms: 9d + -9d = 0 4 + -2d = 0 Add '-4' to each side of the equation. 4 + -4 + -2d = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -2d = 0 + -4 -2d = 0 + -4 Combine like terms: 0 + -4 = -4 -2d = -4 Divide each side by '-2'. d = 2 Simplifying d = 2
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