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y in (-oo:+oo)
1 = y/0.2+20 // - y/0.2+20
1-(y/0.2)-20 = 0
1-5*y-20 = 0
-5*y-19 = 0 // + 19
-5*y = 19 // : -5
y = 19/(-5)
y = -19/5
y = -19/5
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