Solve the equation: 3d/5 - d/10 = d - 5/2

I know this is not that hard but I get stuck on half way of the problem.. help please! & could you explain it also so I can get it right next time? thanks
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1 Answer

start: (3/5)d -(1/10)d=d-(5/2)

[(6-1)/10]d  -d=-5/2

(1/2)d -d=-5/2

-(1/2)d=-5/2

-d=-5

d=5
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