7d+13d-7d=-13

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Solution for 7d+13d-7d=-13 equation: 



7d+13d-7d=-13

We move all terms to the left:

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

We add all the numbers together, and all the variables

13d+13=0

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

13d=-13

d=-13/13

d=-1

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