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Simplifying 7d + -20 = 12d Reorder the terms: -20 + 7d = 12d Solving -20 + 7d = 12d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-12d' to each side of the equation. -20 + 7d + -12d = 12d + -12d Combine like terms: 7d + -12d = -5d -20 + -5d = 12d + -12d Combine like terms: 12d + -12d = 0 -20 + -5d = 0 Add '20' to each side of the equation. -20 + 20 + -5d = 0 + 20 Combine like terms: -20 + 20 = 0 0 + -5d = 0 + 20 -5d = 0 + 20 Combine like terms: 0 + 20 = 20 -5d = 20 Divide each side by '-5'. d = -4 Simplifying d = -4
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