(2.1)d+0.7=7

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Solution for (2.1)d+0.7=7 equation: 



(2.1)d+0.7=7

We move all terms to the left:

(2.1)d+0.7-(7)=0

We add all the numbers together, and all the variables

(2.1)d-6.3=0

We multiply parentheses

2.1d-6.3=0

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

2.1d=6.3

d=6.3/2.1

d=3+-8.8817841970013E-16/2.1

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