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y in (-oo:+oo)
3*((-20*y)/3)-y = 3*3*(30/5)-y // - 3*3*(30/5)-y
3*((-20*y)/3)-y+y-(3*3*(30/5)) = 0
3*((-20*y)/3)-y+y-54 = 0
-20*y-54 = 0 // + 54
-20*y = 54 // : -20
y = 54/(-20)
y = -27/10
y = -27/10
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