(7d-3d)+5=13

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Solution for (7d-3d)+5=13 equation: 



(7d-3d)+5=13

We move all terms to the left:

(7d-3d)+5-(13)=0

We add all the numbers together, and all the variables

(+4d)+5-13=0

We add all the numbers together, and all the variables

(+4d)-8=0

We get rid of parentheses

4d-8=0

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

4d=8

d=8/4

d=2

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