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9d-45=3(3d-15)
We move all terms to the left:
9d-45-(3(3d-15))=0
We calculate terms in parentheses: -(3(3d-15)), so:We get rid of parentheses
3(3d-15)
We multiply parentheses
9d-45
Back to the equation:
-(9d-45)
9d-9d+45-45=0
We add all the numbers together, and all the variables
=0
d=0/1
d=0
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