2.8-0.7d=-3.5

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Solution for 2.8-0.7d=-3.5 equation: 



2.8-0.7d=-3.5

We move all terms to the left:

2.8-0.7d-(-3.5)=0

We add all the numbers together, and all the variables

-0.7d+6.3=0

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

-0.7d=-6.3

d=-6.3/-0.7

d=+9

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