7d+2d+4d-4d-7d=18

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Solution for 7d+2d+4d-4d-7d=18 equation:



7d+2d+4d-4d-7d=18
We move all terms to the left:
7d+2d+4d-4d-7d-(18)=0
We add all the numbers together, and all the variables
2d-18=0
We move all terms containing d to the left, all other terms to the right
2d=18
d=18/2
d=9

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