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y in (-oo:+oo)
1/5-(y/4) = 3/20 // - 3/20
1/5-(y/4)-(3/20) = 0
1/5-(y/4)-3/20 = 0
1/20-1/4*y = 0 // - 1/20
-1/4*y = -1/20 // : -1/4
y = -1/20/(-1/4)
y = 1/5
y = 1/5
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