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6d=(90+180)
We move all terms to the left:
6d-((90+180))=0
We add all the numbers together, and all the variables
6d-(270)=0
We add all the numbers together, and all the variables
6d-270=0
We move all terms containing d to the left, all other terms to the right
6d=270
d=270/6
d=45
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