16y-40-12y+28-6a+2y+12=0
16y-12y-6a+2y=40-28-12
6y-6a=0
6(y-a)=0
y-a=0
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16y-40-12y+28-6a+2y+12=0
16y-12y-6a+2y=40-28-12
6y-6a=0
6(y-a)=0
y-a=0