-7d+-13d+7=-13

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



-7d+-13d+7=-13

We move all terms to the left:

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

We add all the numbers together, and all the variables

-20d+20=0

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

-20d=-20

d=-20/-20

d=1

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