2(-1.4+0.6d)+0.4d=-8.4

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Solution for 2(-1.4+0.6d)+0.4d=-8.4 equation: 



2(-1.4+0.6d)+0.4d=-8.4

We move all terms to the left:

2(-1.4+0.6d)+0.4d-(-8.4)=0

We add all the numbers together, and all the variables

2(0.6d-1.4)+0.4d-(-8.4)=0

We add all the numbers together, and all the variables

0.4d+2(0.6d-1.4)+8.4=0

We multiply parentheses

0.4d+0d-2.8+8.4=0

We add all the numbers together, and all the variables

1.4d+5.6=0

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

1.4d=-5.6

d=-5.6/1.4

d=-4

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