1/3(5y+1)+(1/3-1/3y)=(3y-1/3)-(y+1/3) y=?

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1/3(5y+1)+(1/3-1/3y)=(3y-1/3)-(y+1/3)y=?1/3(5y+1)+(1/3-1/3y)=(3y-1/3)-(y+1/3)y=?1/3(5y+1)+(1/3-1/3y)

1/3(5y+1)+(1/3-1/3y)=(3y-1/3)-(y+1/3) y=?
1/3(5y+1)+(1/3-1/3y)=(3y-1/3)-(y+1/3) y=?

1/3(5y+1)+(1/3-1/3y)=(3y-1/3)-(y+1/3) y=?
方程两边乘以3
5y+1+1-y=9y-1-3y-1
4=2y
y=2

.............y=2