y=3x+6x2+10x3+... ... ... ... ...
⇒1+y=1+3x+6x2+10x3+ ... =(1-x)-3
⇒1+y-13=(1-x)-3×-13
⇒1-x=(1+y)-13
⇒1-x=1-13y+-13-13-12!y2+-13-13-1-13-23!y3+...
অতএব, x=13y-132.42!y2+1.4.733.3!y3_.... (showed)
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