80=7d+3d

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Solution for 80=7d+3d equation: 



80=7d+3d

We move all terms to the left:

80-(7d+3d)=0

We add all the numbers together, and all the variables

-(+10d)+80=0

We get rid of parentheses

-10d+80=0

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

-10d=-80

d=-80/-10

d=+8

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