(28-y)-(-0,8)=12/25
28-у+0,8 =12/25
у=28,8 -0,48
у=28,32
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(28-y)-(-0,8)=12/25
28-у+0,8 =12/25
у=28,8 -0,48
у=28,32
28.8-y=12/25
28.8*25- y*25=12/25*25
720-25y=12
-25y=-708
y=28.32