-2+6.4d=4.21+8.7d

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Solution for -2+6.4d=4.21+8.7d equation: 



-2+6.4d=4.21+8.7d

We move all terms to the left:

-2+6.4d-(4.21+8.7d)=0

We add all the numbers together, and all the variables

6.4d-(8.7d+4.21)-2=0

We get rid of parentheses

6.4d-8.7d-4.21-2=0

We add all the numbers together, and all the variables

-2.3d-6.21=0

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

-2.3d=6.21

d=6.21/-2.3

d=-2+1/1.4285714285714

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