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Simplifying 21 + -4d = 12 + 7d Solving 21 + -4d = 12 + 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. 21 + -4d + -7d = 12 + 7d + -7d Combine like terms: -4d + -7d = -11d 21 + -11d = 12 + 7d + -7d Combine like terms: 7d + -7d = 0 21 + -11d = 12 + 0 21 + -11d = 12 Add '-21' to each side of the equation. 21 + -21 + -11d = 12 + -21 Combine like terms: 21 + -21 = 0 0 + -11d = 12 + -21 -11d = 12 + -21 Combine like terms: 12 + -21 = -9 -11d = -9 Divide each side by '-11'. d = 0.8181818182 Simplifying d = 0.8181818182
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