0.8(3y-6-y)=3y-6+y-13.2

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0.8(3y-6-y)=3y-6+y-13.20.8(3y-6-y)=3y-6+y-13.20.8(3y-6-y)=3y-6+y-13.22.4y-4.8-0.8y=4y-19.20.8y=14.4y

0.8(3y-6-y)=3y-6+y-13.2
0.8(3y-6-y)=3y-6+y-13.2

0.8(3y-6-y)=3y-6+y-13.2
2.4y-4.8-0.8y=4y-19.2
0.8y=14.4
y=18

0.8(2y-6)=4y-19.2
1.6y-4.8=4y-19.2
2.4y=14.4
y=6

原式:2.4y-4.8-0.8y=3y-6+y-13.2
1.6y-4.8=4y-19.2
14.4=2.4y
y=6