0.8d+1.3d-7.4=-20

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Solution for 0.8d+1.3d-7.4=-20 equation: 



0.8d+1.3d-7.4=-20

We move all terms to the left:

0.8d+1.3d-7.4-(-20)=0

We add all the numbers together, and all the variables

2.1d+12.6=0

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

2.1d=-12.6

d=-12.6/2.1

d=-6+-1.7763568394003E-15/2.1

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