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2(d-4)=5(2d+1)
We move all terms to the left:
2(d-4)-(5(2d+1))=0
We multiply parentheses
2d-(5(2d+1))-8=0
We calculate terms in parentheses: -(5(2d+1)), so:We get rid of parentheses
5(2d+1)
We multiply parentheses
10d+5
Back to the equation:
-(10d+5)
2d-10d-5-8=0
We add all the numbers together, and all the variables
-8d-13=0
We move all terms containing d to the left, all other terms to the right
-8d=13
d=13/-8
d=-1+5/8
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