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8y-2y-12y=9-12
-6y=-3
y=-6/-3=2
y+5=2+5=7
8y+12-2y=12y+9
6y+12=12y+9
6y-12y=9-12
-6y=-3
y=0,5
jadi, y+5=0,5+5=5,5