20d-15d+-7d+d=12

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Solution for 20d-15d+-7d+d=12 equation: 



20d-15d+-7d+d=12

We move all terms to the left:

20d-15d+-7d+d-(12)=0

determiningTheFunctionDomain
20d-15d-7d+d-12+=0

We add all the numbers together, and all the variables

-d=0

d=0/-1

d=0

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