How do you work out the value of "d" in the equation: 7d=4d+21?
Subtract 4d from each side. / / / 3d = 21. / / / Divide each side by 3. / / / d = 7 .
I'm not completely positive but I believe this is how you do it.
7d - 4d = 21
3d = 21
3d / 3 = 21 / 3
d = 7
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Mathematics, published 11.05.2023
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