6d-d+3d+3d-d=20

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Solution for 6d-d+3d+3d-d=20 equation:



6d-d+3d+3d-d=20
We move all terms to the left:
6d-d+3d+3d-d-(20)=0
We add all the numbers together, and all the variables
10d-20=0
We move all terms containing d to the left, all other terms to the right
10d=20
d=20/10
d=2

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