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Simplifying 13 + -4d = 49 + -7d Solving 13 + -4d = 49 + -7d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '7d' to each side of the equation. 13 + -4d + 7d = 49 + -7d + 7d Combine like terms: -4d + 7d = 3d 13 + 3d = 49 + -7d + 7d Combine like terms: -7d + 7d = 0 13 + 3d = 49 + 0 13 + 3d = 49 Add '-13' to each side of the equation. 13 + -13 + 3d = 49 + -13 Combine like terms: 13 + -13 = 0 0 + 3d = 49 + -13 3d = 49 + -13 Combine like terms: 49 + -13 = 36 3d = 36 Divide each side by '3'. d = 12 Simplifying d = 12
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