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Simplifying 2(d + -3) + 2d = 30 Reorder the terms: 2(-3 + d) + 2d = 30 (-3 * 2 + d * 2) + 2d = 30 (-6 + 2d) + 2d = 30 Combine like terms: 2d + 2d = 4d -6 + 4d = 30 Solving -6 + 4d = 30 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 4d = 30 + 6 Combine like terms: -6 + 6 = 0 0 + 4d = 30 + 6 4d = 30 + 6 Combine like terms: 30 + 6 = 36 4d = 36 Divide each side by '4'. d = 9 Simplifying d = 9
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