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Simplifying 21d + 42e = 63 Solving 21d + 42e = 63 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-42e' to each side of the equation. 21d + 42e + -42e = 63 + -42e Combine like terms: 42e + -42e = 0 21d + 0 = 63 + -42e 21d = 63 + -42e Divide each side by '21'. d = 3 + -2e Simplifying d = 3 + -2e
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