7d+d=240

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Solution for 7d+d=240 equation: 



7d+d=240

We move all terms to the left:

7d+d-(240)=0

We add all the numbers together, and all the variables

8d-240=0

We move all terms containing d to the left, all other terms to the right

8d=240

d=240/8

d=30

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