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330=870(1-d)
We move all terms to the left:
330-(870(1-d))=0
We add all the numbers together, and all the variables
-(870(-1d+1))+330=0
We calculate terms in parentheses: -(870(-1d+1)), so:We get rid of parentheses
870(-1d+1)
We multiply parentheses
-870d+870
Back to the equation:
-(-870d+870)
870d-870+330=0
We add all the numbers together, and all the variables
870d-540=0
We move all terms containing d to the left, all other terms to the right
870d=540
d=540/870
d=18/29
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