-13=2.1+d

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Solution for -13=2.1+d equation: 



-13=2.1+d

We move all terms to the left:

-13-(2.1+d)=0

We add all the numbers together, and all the variables

-(d+2.1)-13=0

We get rid of parentheses

-d-2.1-13=0

We add all the numbers together, and all the variables

-1d-15.1=0

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

-d=15.1

d=15.1/-1

d=-15+0.1/1

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