4(y-2)- {5(1-2y)- 4(5y-1)}=0.

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4(y-2)- {5(1-2y)- 4(5y-1)}=0.

4(y-2)- {5(1-2y)- 4(5y-1)}=0.
4(y-2)- {5(1-2y)- 4(5y-1)}=0.

4(y-2)- {5(1-2y)- 4(5y-1)}=0.
4(y-2)- {5(1-2y)- 4(5y-1)}=0
4y-8-(5-10y-20y+4)=0
4y-8-(9-30y)=0
4y-8-9+30y=0
4y+30y=8+9
34y=17
y=17/34
y=1/2

4y-8-[5-10y-20y+4]=0
4y-8-5+10y+20y-4=0
34y-17=0
34y=17
y=1/2

0花开0若相惜0 ,你好!
4(y-2)- {5(1-2y)- 4(5y-1)}=0
=>4(y-2)- {5-10y- 20y+4)}=0
=>4y-8- {9-30y}=0
=>34y-17=0
=>y=17/34=1/2

4y-8-(5-10y-20y+4)=0
4y-8-9+30y=0
34y=17
y=0.5

4y-8-[5-10y-20y+4]=0
解得:y=1/2或0.5