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In Mathematics / High School | 2014-05-25

How do you work out the value of "d" in the equation:

\[ 7d = 4d + 21 \]

Asked by queenxmeg

Answer (3)

Subtract 4d from each side. / / / 3d = 21. / / / Divide each side by 3. / / / d = 7 .

Answered by AL2006 | 2024-06-10

I'm not completely positive but I believe this is how you do it.
7d=4d+21
7d - 4d = 21
3d = 21
3d / 3 = 21 / 3
d = 7

Answered by katiebear17 | 2024-06-10

To solve the equation 7 d = 4 d + 21 , subtract 4 d from both sides to get 3 d = 21 . Then, divide by 3 to find d = 7 . Always check your answer by substituting back into the original equation.
;

Answered by AL2006 | 2024-10-10

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