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Simplifying 55 = 7 + 4d Solving 55 = 7 + 4d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-4d' to each side of the equation. 55 + -4d = 7 + 4d + -4d Combine like terms: 4d + -4d = 0 55 + -4d = 7 + 0 55 + -4d = 7 Add '-55' to each side of the equation. 55 + -55 + -4d = 7 + -55 Combine like terms: 55 + -55 = 0 0 + -4d = 7 + -55 -4d = 7 + -55 Combine like terms: 7 + -55 = -48 -4d = -48 Divide each side by '-4'. d = 12 Simplifying d = 12
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