10d+d+-7=-20

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Solution for 10d+d+-7=-20 equation: 



10d+d+-7=-20

We move all terms to the left:

10d+d+-7-(-20)=0

We add all the numbers together, and all the variables

11d+13=0

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

11d=-13

d=-13/11

d=-1+2/11

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