800+16d=720+21d

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Solution for 800+16d=720+21d equation: 



800+16d=720+21d

We move all terms to the left:

800+16d-(720+21d)=0

We add all the numbers together, and all the variables

16d-(21d+720)+800=0

We get rid of parentheses

16d-21d-720+800=0

We add all the numbers together, and all the variables

-5d+80=0

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

-5d=-80

d=-80/-5

d=+16

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