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y in (-oo:+oo)
4 = 0.8*(y/6) // - 0.8*(y/6)
4-(0.8*(y/6)) = 0
4-0.13333333*y = 0
4-0.13333333*y = 0 // - 4
-0.13333333*y = -4 // : -0.13333333
y = -4/(-0.13333333)
y = 30.00000075
y = 30.00000075
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