-2(d+1.4)-1.8=20.5

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Solution for -2(d+1.4)-1.8=20.5 equation: 



-2(d+1.4)-1.8=20.5

We move all terms to the left:

-2(d+1.4)-1.8-(20.5)=0

We add all the numbers together, and all the variables

-2(d+1.4)-22.3=0

We multiply parentheses

-2d-2.8-22.3=0

We add all the numbers together, and all the variables

-2d-25.1=0

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

-2d=25.1

d=25.1/-2

d=-12+1/1.8181818181818

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