D(x)=13-1.5x

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Solution for D(x)=13-1.5x equation: 



(D)=13-1.5D

We move all terms to the left:

(D)-(13-1.5D)=0

We add all the numbers together, and all the variables

D-(-1.5D+13)=0

We get rid of parentheses

D+1.5D-13=0

We add all the numbers together, and all the variables

2.5D-13=0

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

2.5D=13

D=13/2.5

D=5+0.5/2.5

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